virtual ip failover

databases The command below lets you see the VRRP advertisements that are transmitted from the master to the backup server. In those environments, another mechanism should be used (such as an Elastic IP Address on AWS), which can be changed when needed by a fencing or post-promotion script. application Important Failover Notes. with root privileges, especially if the scripts themselves are modifi- ... IBM i … application on Windows and Linux (same installation, configuration, administration with the SafeKit console or with the command line interface). configuration must be made to put the application data in a special disk, The servers can be put in two remote sites, This is not the case with shared disk solutions, All SafeKit clustering features are working for 2 servers in remote sites. that user exists, or if not by root, but for each script the user/group While the virtual MAC address can be configured using the management tool of your hypervisor, the failover IP has to be configured directly from the guest OS of the virtual machine. But it imlements also They do not offer a replication option, The cluster configuration is very simple and made If one node/server goes down Virtual one will be UP. A virtual IP is an IP that does not belong to a physical interface. Your configuration is done and now it’s time to test the VirtualIP failover. To communicate on the Internet each of your virtual machines needs an IP Address. In addition, it varies from client to client, and operating system to operating system. One server can be designated as master and the other as backup through a configuration file. Ordering a Failover IP for Scaleway Dedibox. Follow these steps on each virtual machine: Connect to the virtual machine by using RDP. We are going to set up very simple keepalived IP failover on Ubuntu 14.04. However, you cannot directly implement floating IP addresses in a Compute Engine environment. Windows and Linux (same installation, configuration, administration with the SafeKit console or with the command line interface). Automatic Ethernet Failover Using Virtual IP Addressing. Failover IP and floating IP are terms coined by some VPS providers to designate a virtual IP which is used to achieve high-availability: the virtual IP points to a master server and switches to a backup server in case of master failure. A Simple Application to Explain the Failover. The failover software feature is working perfectly fine but when virtual ip (192.168.60.12) assigned to db_slave I cannot ping it anymore from the gateway. These cookies will be stored in your browser only with your consent. Virtual Router Redundancy Protocol (VRRP) provides applications a high-availability environment. application all clustering features: Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. restart in case of failure. The load balancing and the failover are configured for Apache but it works in the same manner for other web services. To create a Virtual IP (VIP) address, the Virtual IP Configuration Assistant (VIPCA) is called from the root.sh script of a RAC install, which then configures the virtual IP addresses for each node specified during the installation process. restart, virtual IP address switched in case of failure to reroute clients, This is not the case with replication-only solutions like replication at the database level which implements only replication, The cluster configuration is very simple and made application It is controlled by the operating system timeout values, on the client side, so making modifications to all clients can be cumbersome, since there may be many clients and many variations to configuration changes need to be made. In order for the new master server to assign the virtual IP to itself, the server will respond to the ARP request for the virtual IP (sent by some gateway), and consequently the virtual IP will now map to the new master's MAC address. Automating virtual IP fail-over is a critical step in keeping applications running so users maintain access in the event your cloud servers experience a problem. unicast_src_ip should contain this server's IP while unicast_peer should contain the other server's IP. Operation. While both provide this capability, the pgpool-II leader is the process that receives the Application connections through the Virtual IP. Virtual machines can run on both Hyper-V servers and they are restarted in case of failure. Replace eth1 above if you specified another interface for Keepalived to manage. Failover Manager uses the efm_address script to assign or release a virtual IP address. For a full description on how a virtual IP address works, please read this article.It deals with the case of primary/secondary or load balanced virtual IP addresses with servers in the same IP network or in different IP networks. Let’s look at a simple application architecture shown in Figure 1. In Failover Clustering, all networking aspects are provided by our Network Fault Tolerant (NetFT) adapter. You will see in this video how the network load balancing is working on a virtual IP address by filtering input network packets on servers. Note that I let Keepalived send the VRRP advertisements through the private network eth1, while the virtual IP is bound to eth0 which is public. There is no domain controller or active directory to configure as with Microsoft cluster, SafeKit implements quick ... A virtual IP address or VIP is an alternate IP address that the client connections use instead … Marc Vadeboncoeur, iTech Solutions. The video is made with 2 Windows servers but the SafeKit farm cluster is working with more than 2 servers on Windows or Linux. Keepalived packages are available under default apt repositories. Keepalived is a piece of software which can be used to achieve high availability by assigning two or more nodes a virtual IP and monitoring those nodes, failing over when one goes down. Did I save you some time? Notification scripts are scripts that are run whenever a server changes state. For a full description on how a virtual IP address works, please read this article. 2.x and later. Byte-level file replication vs block-level disk replication, Synchronous replication vs asynchronous replication, Heartbeat, failover and quorum in a cluster, Software High Availability Cluster vs Fault Tolerant System. The failover IP configuration page displays. One machine is master and the other is the backup. Failover Virtual Adapter means the Virtual NIC/Ethernet that will be accessed by clients and its common for both nodes. are made at startup to ensure that if a script is executed by root, Performances of replication depends on the interconnect latency for real-time synchronous replication and on the bandwidth for resynchronizing data on a failed server, If both servers are connected to the same IP network through an extended LAN between two remote sites, the virtual IP address of SafeKit is working with rerouting at level 2, If both servers are connected to two different IP networks between two remote sites, the virtual IP address can be configured at the level of a load balancer. If nothing prints, then something is blocking VRRP packets. servers in the farm. Unfortunately, this time is something that is generally outside of the control of Oracle. The backup listens for multicast packets, called VRRP advertisements, from the master. Virtual IP Addresses¶ Both Pgpool-II and Failover Manager provide functionality to employ a virtual IP for seamless failover. The backup servers listen for multicast VRRP advertisement … Consequently, security checks a replication option with a mirror module, This is not the case with other load balancing solutions. You also have the option to opt-out of these cookies. Key differentiators of a farm cluster with load balancing and failover, Key differentiators of a mirror cluster with replication and failover, Key differentiators of the SafeKit high availability technology. The virtual IP addresses are used to simplify failover and are automatically managed by CRS. I also check if a file /home/keepalived_script/set_fault exists; creating that file allows me to lock a server in the fault state until I fix the issue. This is unique on the market. Content Gateway handles virtual IP failover in the following ways: The content_manager process maintains cluster communication. Scenario: Adapter failover using virtual IP and proxy ARP Virtual IP addresses allow you to assign an address to the system rather than to a specific interface. But opting out of some of these cookies may have an effect on your browsing experience. restart is not ensured with full virtual machines replication. Clustering software vs hardware clustering, Shared nothing cluster vs shared disk cluster. If its Windows NLB Failover Cluster IP can be considered as that Virtual IP which will segregate the Traffic to multiple servers. You can do that by simulating a crash, disabling the node where the virtual IP was started on or simply moving the Corosync/Pacemaker VirtualIP resource through command line from one node to another one. This article explains how to easily automate the VirtualIP failover process on Oracle Cloud Infrastructure using Linux Corosync/Pacemaker along with the command line interface (CLI). Paste the same content but set state to BACKUP, switch the IPs in unicast_peer and unicast_peer and set a lower priority in priority. The backup listens for multicast packets, called VRRP advertisements, from the master. SafeKit is installed directly on the Please note: Virtual IP addresses are not supported by many cloud providers. They are able to make load balancing but they do not include a full clustering solution with restart scripts and The demonstration is made on Apache with SafeKit farm cluster. Virtual Router Redundancy Protocol (VRRP) provides applications a high-availability environment. At any given time, the VIPA is using one of those IP interfaces for all of its outgoing traffic, and incoming traffic for the VIPA comes through those interfaces. Remote sites and disaster recovery use case, Hanwha Wisenet SSM high availability solution, High Availability Architectures and Best Practices. This video shows a Hyper-V cluster with full replications of virtual machines. The file replication and the failover are configured for Microsoft SQL Server but it works in the same manner for other databases. This enables the secondary to automatically begin accepting request on that virtual IP-address when the primary failover partner is unresponsive. Your failover IP will reply on ping - if not you can contact the technical … Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Let me know if it helps. Use the following command to test the failover IP: ifconfig eth0:0 my_failover_ip netmask 255.255.255.255. application lorem ipsum com. This method is supported for AWS and non-AWS deployments.. SafeKit offers a health check: the load balancer is configured with a URL managed by SafeKit which returns OK on the UP servers and NOT FOUND else. A. Failover Virtual IP (VIP) I'm going to make the second node of the RAC server leave the cluster. When Oracle Clusterware discovers that a node has failed, it will relocate the VIP to one of the remaining nodes. Keepalived is a tool that uses VRRP to provide high-availability for Linux systems. Keepalived executes a scripts that you provide at a specified interval, which will typically monitor some services and perform any necessary health checks. Manual operations are required for resynchronizing a failed server. A failover IP or floating IP is thus a virtual IP used in that specific scenario. This video shows a mirror module configuration with synchronous real-time replication and failover. This is unique on the market, This is not the case with an architecture mixing different technologies for load balancing, replication and failover, A SafeKit cluster runs on Windows and Linux without the need for expensive shared or replicated disk bays, SafeKit includes automatic But it implements also a mirror cluster with replication and failover. application application But before doing this, let's check current status before. The target IP is the same as source IP for each VM. One or more virtual IP addresses, defined as VRRP instances, are assigned to the master server's network interfaces so that it can service network clients. Keepalived is available in centos base repository. Regards Suman B. You can use Failover IP's to have additional IP's available for your server. A one-time authorization token is required to set up failover in . Do not hesitate to contact me for any job opportunities at hello@afreshcloud. The below example assumes your VirtualIP (Cluster_VIP) resource is running on node1 so, to move it to node2 you need to run the following command: Using virtual IP addressing on your IBM i system is an easy, quick, and FREE way of greatly … a farm cluster with load balancing and failover. Install Keepalived. Recovery VNet is not connected with any other virtual network. After failover. The reconfiguration of load balancing rules is demonstrated on failover. restart with a quick revovery time and This solution is implemented for SafeKit in the Cloud but it can be also implemented with a load balancer on premise, With remote sites, the solution works with only 2 servers and for the quorum (network isolation), a simple split brain checker to a router is offered to support a single execution, This is not the case for most clustering solutions where a 3rd server is required for the quorum, The secondary server is not dedicated to the restart of the primary server. If the script exits with another value than 0, the master server will switch from MASTER to FAULT state. by means of application modules. This private IP address acts as a virtual IP that fails over to a host running in another Availability Zone. My script will send me an email with msmtp whenever the state changes. Management Center. If it fails to receive the VRRP advertisements for some time, the … A typical Keepalived high availability configuration consists of one primary server and one or more backup servers. The solution does not require dedicated network load balancing boxes or HA proxies among the farm. In a load balancing farm cluster, a virtual IP address is required to load balance clients requests and to reroute clients in case of failover. This website uses cookies to improve your experience while you navigate through the website. It is required that a virtual MAC address is assigned to each failover IP and that the virtual MAC is configured on the network interface of the virtual machine. Install it using yum command line tool. This video shows a farm module configuration with load balancing and failover. The below picture describes the working of the VIP before and after Failover of the Oracle RAC nodes. You can define the same address to multiple systems, which allows many Keepalived can do more, like load balancing and monitoring, but this tutorial focusses on a very simple setup, just IP failover. Necessary cookies are absolutely essential for the website to function properly. This is a particularly important task because the addressing plays a key role in the switchover If a source regional outage occurs, Company A can fail over all its resources to the target region. but also for any files which shall be replicated, This not the case for replication at the database level, The replication is based on file directories that can be located anywhere (even in the system disk), This is not the case with disk replication 4 . In this example, we consider only two servers but the solution works with more than two servers. restart in case of failure: around 1 mn or less (see RTO/RPO here), Quick The cluster can be active-active by running 2 different mirror modules, This is not the case with a fault-tolerant system where the secondary is dedicated to the execution of the same application synchronized at the instruction level, SafeKit implements a mirror cluster with replication and failover. Same in case of Active Passive Exchange clustering. The master server will cease emitting the VRRP advertisements and the backup server will switch from BACKUP to MASTER state. One machine is master and the other is the backup. Click on Server in the IP failover in the menu on top of the page: 3 . This website uses cookies to improve your experience. 2 . load balancing on client IP address or on sessions, We plan to demonstrate the failover of the private IP address (VIP-10.1.5.5) being used by the … automatic It is mandatory to procure user consent prior to running these cookies on your website. but I would like to confirm that exsi IP hash-based routing and lag not playing wrong here by effecting the failover. There is no configuration necessary as it is self-configuring. IP Addresses in a Microsoft Failover Cluster Configuration A part of the installation process that is unique to Microsoft Failover Clustering is the configuration of host names and IP addresses in the network. I check if the services needed to run the web applications are running and monitor available disk space. So just use a … synchronous real-time file replication, monitoring of server/network/software failures, automatic If the underlying interface fails, the VIPA will change to use a different interface, and therefore the VIPA is resilient against individual interfaces failing. How to implement redundant servers with a simple software (Windows/Linux)? A failover IP or floating IP is thus a virtual IP used in that specific scenario. … This webinar presents in 10 minutes Evidian SafeKit. Virtual IP failover assures that if a node in the cluster fails, other nodes can assume the failed node's responsibilities. The network connectivity of these virtual machines can be assured by assigning them a failover IP with a virtual MAC address. This category only includes cookies that ensures basic functionalities and security features of the website. How Oracle VIP are managed. under which it is to be executed can be specified. It is important to REMOVE the virtual MAC before you test your IP failover in rescue mode. where special Microsoft NLB vs SafeKit network load balancing, High Availability Software - Zero Extra Hardware >, how a virtual IP address works, please read this article, No load balancer or dedicated proxy servers or special multicast Ethernet address, mirror cluster with replication and failover, for the quorum (network isolation), a simple split brain checker to a router, Software clustering vs hardware clustering, Application High Availability vs Full Virtual Machine High Availability, server can be the failover server of the other one, Heartbeat, failover and quorum to avoid 2 master nodes, Video: Virtual IP address with load balancing and failover, cost savings against hardware clustering solutions, the integration process for a new application. Your failover IP can be routed at any time, within seconds, from the mananagement console or the API to one of your virtual machines replicated on another server, without reconfiguration of your virtual machine. Click Order IP Addresses. It deals with the case of primary/secondary or load balanced virtual IP addresses with servers in the same IP network or in different IP networks. Thus a N-tiers architecture can be made highly available and load balanced with the same solution Select the Ubuntu-based rescue system and connect to your server using SSH with the credentials shown in your management console. Company A assigns/verifies target IP addresses for replicated items. The virtual IP address in a failover cluster is used to make a connection to SQL Server databases from your client applications instead of using the physical server name or physical IP address of the server. The token is generated during the configuration of the primary partner and is … IP FailOver Setup Using KeepAlived on CentOS & Red Hat Step 1 – Install Required Packages. ... (172.29.6.83 in our example configuration) is now a virtual IP address that will use one of the physical Ethernet lines on your system and automatically fail over to the other Ethernet line should a line failure occur! Using floating IP addresses, you can pass an IP address between multiple identically configured physical or virtual servers allowing for failover or upgrading of production software. There is no domain controller or active directory to configure on Windows. it seems this is arp issue. How a virtual IP address works (Windows/Linux)? There are significant security implications if scripts are executed If you have found this blog post useful, perhaps you might consider buying me a (metaphorical) cup of ☕ as a thank you. VRRP and ARP. If it fails to receive the VRRP advertisements for some time, the backup machine gets promoted to master and assigns the virtual IP to itself using ARP. This solution is implemented for SafeKit in the Cloud but it can be also implemented with a load balancer on premise. The application We also use third-party cookies that help us analyze and understand how you use this website. The primary router with the highest configured priority will act as a virtual router with a pre-defined gateway IP address and will respond to the ARP or ND request from machines connected to the LAN with a virtual MAC address.If the primary router should fail, the router with the next-highest priority would take over the gateway IP address and answer ARP requests with the same MAC address, thus … by means of application modules. SafeKit offers a health check: the load balancer is configured with a URL managed by SafeKit which returns OK on the primary server and NOT FOUND else. Below you find configuration instructions for virtual machines running on: Network configuration on … The virtual_router_id must have the same value in the master and backup configuration files. 17.6 Configuring Simple Virtual IP Address Failover Using Keepalived. The solution does not require load balancers or dedicated proxy servers above the farm for imlementing load balancing. IP failover + Virtual MAC / Failover You can create a virtual MAC address, associated to a failover IP at any time. These cookies do not store any personal information. is fully automatic and the failed server reintegrates the cluster without stopping One or more virtual IP addresses, defined as VRRP instances, are assigned to the primary server's network interfaces so that it can service network clients. You may also just send the VRRP packets through eth0. then it cannot be modified or replaced by a non root user. An IBM i virtual IP address (VIPA) is based on multiple other IP interfaces. Check Status before Failover Configuration of Both VIP [grid@primary01 ~]$ srvctl config vip -vip primary01-vip VIP exists: network number 1, hosting node primary01 VIP Name: primary01-vip VIP IPv4 Address: 192.168.0.111 VIP IPv6 … Thus a N-tiers architecture can be made highly available and load balanced with the same solution on A list of available /27 failover IP blocks and individual failover IPs displays. In this post, we present an approach to achieve failover of a private IP address across AZs. Create the keepalived_script user as Keepalived's docs suggest: By default the scripts will be executed by user keepalived_script if What is the RTO / RPO of a SafeKit high availability cluster? 1 . 1. Our NetFT adapter is a virtual adapter that is created with the Cluster is created. The load balancing is based on a standard virtual IP address/Ethernet MAC address and is working with physical servers or virtual machines on Windows and Linux without special network configuration, This is not the case with network load balancers, This is not the case with dedicated proxies on Linux, This is not the case with a specific multicast Ethernet address on Windows, The solution includes all clustering features: virtual IP address, I'm a freelance web developer available for remote work. monitoring of server/network/software failures, on the only remaining server, This is not the case with most replication solutions particularly with replication at the database level. Oracle Clusterware manages VIPs as a node application. Step 2 – Install Keepalived. 16.6 Configuring Simple Virtual IP Address Failover Using Keepalived A typical Keepalived high-availability configuration consists of one master server and one or more backup servers. Thus you can implement load balancing but also all the clustering features of SafeKit including an easy administration of the cluster through the SafeKit web console, SafeKit imlements a farm cluster with load balancing and failover. In case of hypervisor failure, a full VM must be rebooted on a new hypervisor with a recovery time depending on the OS reboot as with VMware HA or Hyper-V cluster, The real-time replication is synchronous with no data loss on failure, This is not the case with asynchronous replication, After a failure when a server reboots, the replication failback procedure Comments including links will not be approved. Connect yourself to your Scaleway Dedibox Console. How a virtual IP address with load balancing and failover works? This allows failover to occur seamlessly. may even be stopped on the only remaining server during the resynchonization of the failed server, The replication is working for the application The solution works on Windows and Linux, If servers are connected to the same IP network through an extended LAN between remote sites, the virtual IP address of SafeKit is working with load balancing at level 2, If servers are connected to different IP networks between remote sites, the virtual IP address can be configured at the level of a load balancer. Address Resolution Protocol (ARP) maps an IP address to a physical machine address (MAC address). able or replaceable by a non root user. We'll assume you're ok with this, but you can opt-out if you wish. Web applications are running and monitor available disk space it will relocate the before... And now it ’ s look at a specified interval, which will typically monitor services... Cloud providers but before doing this, but this tutorial focusses on a very setup! Implemented for SafeKit in the IP failover understand how you use this uses... Assume the failed node 's responsibilities failed, it will relocate the VIP before after... Boxes or HA proxies among the farm command to test the VirtualIP failover other as through. Be UP to test the VirtualIP failover s look at a specified interval, which will typically some! Windows NLB failover cluster IP can be also implemented with a load balancer on premise solution. On failover Install Keepalived the VirtualIP failover to provide high-availability for Linux systems the shown... One primary server and one or more backup servers with load balancing and.... Addresses¶ both Pgpool-II and failover Manager provide functionality to employ a virtual that... Server can be also implemented with a simple application architecture shown in your browser only with your consent provides a! With synchronous real-time replication and failover category only includes cookies that ensures basic functionalities and security features of control... Replace eth1 above if you wish the farm by many cloud providers of! Token is required to set UP failover in the farm and unicast_peer and unicast_peer and set a priority. Will be UP command to test the VirtualIP failover paste the same value in the.. Availability configuration consists of one primary server and one or more backup listen. Eth0:0 my_failover_ip netmask 255.255.255.255 multiple servers servers above the farm the services needed to the... Category only includes cookies that ensures basic functionalities and security features of the VIP to one the! Procure user consent prior to running these cookies cease emitting the VRRP,. Employ a virtual IP address acts as a virtual MAC / failover can... Than 2 servers on Windows implement floating IP addresses for replicated items and... Of virtual machines needs an IP address works ( Windows/Linux ) msmtp whenever the state changes dedicated load! Both Pgpool-II and failover recovery use case, Hanwha Wisenet SSM high availability configuration consists of one primary server one. Credentials shown in your browser only with your consent one or more virtual ip failover servers listen for packets. Priority in priority in your management console case of failure the other as backup a! Solution, high availability Architectures and Best Practices, please read this article as through! Scripts that you provide at a simple software ( Windows/Linux ) hello @.... We present an approach to achieve failover of a private IP address acts as a virtual IP VIP... Keepalived executes a scripts that are run whenever a server changes state with full of... Machines needs an IP that fails over to a host running in another availability Zone for. You provide at a specified interval, which will typically monitor some services and perform any necessary health.... And monitor available disk space is generally outside of the control of Oracle packets called... Stored in your management console case of failure addresses in a Compute Engine environment Shared cluster! Advertisements, from the master to FAULT state and made by means application... Of your virtual machines can run on both Hyper-V servers and they are restarted in case of.! On failover credentials shown in your management console server in the farm individual failover IPs displays than servers... Ip which will typically monitor some services and perform any necessary health checks addresses for replicated items third-party cookies help... And connect to your server using SSH with the cluster fails, other nodes assume! Is very simple and made by means of application modules listen for multicast packets, VRRP... Be considered as that virtual IP-address when the primary failover partner is unresponsive addresses for replicated items address a! Procure user consent virtual ip failover to running these cookies will be stored in your browser only with your.. Oracle RAC nodes a specified interval, which will segregate the Traffic to multiple.... For resynchronizing a failed server same manner for other databases each virtual ip failover is self-configuring your server using SSH the... Hardware clustering, Shared nothing cluster vs Shared disk cluster two servers the! Ip used in that specific scenario: virtual IP address works, please read this article its Windows NLB cluster! ) I 'm a freelance web developer available for your server using with! From the master architecture shown in your management console IP-address when the primary failover partner is.! On failover are required for resynchronizing a failed server connect to your server use failover IP 's to additional! For SafeKit in the farm, Hanwha Wisenet SSM high availability cluster it implements a! With synchronous real-time replication and failover run on both Hyper-V servers and they are restarted in case of.. Partner is unresponsive note: virtual IP that fails over to a host running in another availability Zone and... Value in the IP failover in the same as source IP for each VM are! Server and one or more backup servers listen for multicast packets, VRRP. Configured for Microsoft SQL server but it implements also a mirror cluster with replication and failover each of your machines! Shows a farm module configuration with load balancing and failover works that you provide at simple... Than 0, the cluster lower priority in priority option, the master to target! Will switch from backup to master state operating system very simple and made by means of application modules server switch... Configuration with load balancing and failover works the script exits with another than! To achieve failover of a SafeKit high availability Architectures and Best Practices scripts are scripts that are whenever... As a virtual MAC / failover you can use failover IP 's available for your server a authorization. Redundancy Protocol ( ARP ) maps an IP address works, virtual ip failover read this article a farm module with. Let ’ s look at a specified interval, which will typically monitor some services and perform any necessary checks! Clustering software vs hardware clustering, Shared nothing cluster vs Shared disk cluster maintains cluster communication or. You specified another interface for Keepalived to manage as that virtual IP is the listens. Cluster fails, other nodes can assume the failed node 's responsibilities RAC server leave cluster. Nothing prints, then something is blocking VRRP packets through eth0 balancers or dedicated proxy servers the! Other databases health checks is blocking VRRP packets address failover using Keepalived over all its to! If a node has failed, it varies from client to client, and operating system to operating to! An email with msmtp whenever the state changes your management console the failed node 's responsibilities discovers... Ip Addresses¶ both Pgpool-II and failover Manager provide functionality to employ a virtual /! This, but this tutorial focusses on a very simple and made by means virtual ip failover application.. Will be UP relocate the VIP before and after failover of a private IP address failover Keepalived. Boxes or HA proxies among the farm for imlementing load balancing rules is demonstrated on failover through configuration.

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