Im setting up a postgresql replication on two servers centos 6. How to set up an activepassive postgresql cluster with pacemaker, corosync, and drbd centos 5. We are always looking for developers or users interested in clustering or participating in our project. This tutorial will demonstrate how you can use corosync and pacemaker with a floating ip to create a high availability ha server infrastructure on digitalocean. A default drbd synchronization setting means a filesystem sync, which. Linux cluster part 1 install corosync and pacemaker on. When installing pacemaker we will also install corosync that is used to sync the pacemaker cluster details.
How to integrate drbd with pacemaker clusters on linux, configure drbd with pacemaker, drbd pacemaker cluster on linux, drbd pacemaker, drbd pacemaker corosync. Distributed replicated block device to mark the disk on a node as outdated when the communication link goes down. The linuxha stack comprising of corosync and pacemaker can be used to provide a. How to create a high availability setup with corosync. We will use pacemaker as our cluster resource manager and support can be gained for this from linbit as with drbd. Drbd stands for distributed replicated block device and the name already explains what it is. Configuring active passive postgresql cluster using pacemaker. This is the shared san storage from the storage server available to all cluster nodes through iscsi or fcoe. It seems that there is an oder constraint needed, which assures that the mount of the filesystem waits until the drbd resource was promoted to primary sucessfully. High availability with postgresql and pacemaker postgresql wiki. This post explains how to integrate drbd in a cluster with corosync and pacemaker.
As weve mentioned earlier and shown in the introduction diagram, corosync is the conduit that pacemaker uses for communication. Warning the paf project official repository has moved to the clusterlabs organization the clusterlabs organization is managed by the pacemaker. It actually does not implement a cluster, and does not handle failover or monitoring. Postgresql cluster, using pacemaker with corosync and drbd. How to set up an activepassive postgresql cluster with. Now with streaming replication in place, it makes sense to use this robust infrastructure for postgresql. Its original wish is to keep a clear limit between the pacemaker administration and the postgresql. Pacemaker configuration and management tools red hat. Donate to the lcmc the lcmc is a gui application that configures, manages and visualizes highavailability clusters. Install drbd, drbdlinks, pacemaker and corosync on both management nodes. Highavailibility for postgres, based on industry references pacemaker and corosync.
Pacemaker drbd postgresql cluster on centosrhel 7 tekfik. Rely on the postgresql documentation for a proper setup the resource agent requires the postgresql instances to be already set up, ready to start and slaves ready to replicate. Its possible to setup hot standbys with almost zero lag. We have a block device for drbd to manage, and represents an internal or external raid, nvram device, or san.
We package and support all of the software that you need to keep systems up and running. All the techniques and methods used to improve the availability of a system or a service and increase the fault tolerance are called high availability, such example of fault we can mention. Resource failover pacemaker dashboarddata for grafana. Can not start postgresql replication resource with. Setup ha mgmt node with drbd pacemaker corosync xcat. Corosync and pacemaker linux cluster of course supports both activepassive and activeactive modes on multinodes. Readymade agents available to manageresources like apache, postgresql, drbd etc. The corosync pacemaker framework which is part of the linuxha stack can be used to provide monitoring and automatic failover capabilities. If evething is fine, just go ahead now, and install cluster and drbd packages. The following is part 1 of a 4 part series that will go over an installation and configuration of pacemaker, corosync, apache, drbd. Configuring corosync openais the corosync project is a fork of the heartbeat project, and like pacemaker works very very fine with corosync, well use it here.
We have a vm with a popular, recent linux distribution. First download the ocf resource agent from here, and replace the default. Remotely configure both pacemaker and corosync remotely as well as start, stop, and display status information of the cluster pcsd web ui a graphical user interface to create and configure pacemaker corosync. Show the latest posisition of the last primary using pacemaker engine pengine from filebeat and heartbeat for. Activepassive mysql high availability pacemaker cluster. Corosync also binds itself to services that rely on its channels, so it will also launch pacemaker. Activepassive postgresql cluster with pacemaker, corosync, and drbd. Drbd is a linux kernel module that implements synchronous block replication using the network. Our project is used as a high availability framework by projects such as pacemaker and asterisk. Setting up postgresql synchronous or asynchronous replication cluster with. Linux cluster part 1 install corosync and pacemaker on centos 6 learn how to install corosync and pacemaker. Activepassive cluster with pacemaker, corosync and drbd on centos 7. Top pg clustering high availability ha solutions for.
Node level fencing ensures that a node does not run any resources. Prepared by rafael marangoni, from brlink servidor linux team. Setup ha mgmt node with drbd pacemaker corosync xcat 2. The linuxha stack comprising of corosync and pacemaker can. Axigen is a fast, reliable and secure linux, windows, and solaris mail server software, offering integrated smtp, pop3, imap, and webmail servers, enabling the system administrator to have full control of. Set up activepassive postgresql cluster with pacemaker. Postgresql active passive cluster using pacemaker, corosync and drbd. Any application or virtual machine can be made highly available by enabling drbd. Postgresql high availibility with pacemaker devops igor cicimov.
The following steps are quick and dirty, very dirty. On both nodes, first ensure that the drbd service is not enabled on either node. Pacemaker, corosync, drbd, postgresql for high availability failover monitoring. Activepassive cluster with pacemaker, corosync and drbd. Pacemaker postgresql cluster configuration on centosrhel. Generally, an ebook can be downloaded in five minutes or less. Postgresql resource configuration requires the following prerequisites.
This article provides complete configuration details on setting up pacemaker drbd postgresql cluster on centosrhel 7. Postgresql high availability with corosyncpacemaker. Use drbd in a cluster with corosync and pacemaker on. Without that order constraint pacemaker could try to mount the fs while drbd is still in the secondary role, which is not allowed by drbd.
The clusterlabs stack unifies a large group of open source projects related to high availability into a cluster offering suitable for both small and large deployments. The corosyncpacemaker framework which is part of the linuxha stack can be used to provide monitoring and automatic failover capabilities. Postgresql automatic failover quick start centos 7. In this blog we step you through the very basics in setting up a drbd pacemaker ha cluster on ubuntu 16. Its original wish is to keep a clear limit between the pacemaker administration and the postgresql one, to keep things simple, documented and yet powerful. To configure corosync, lets get the actual configuration. Install postgresql and make sure that you disabled automatic startup for it. This can make up the foundation of many clusters as, at the drbd. Set up activepassive postgresql cluster with pacemaker, corosync, and drbd centos march 6, 2017 march 6, 2017 welcome4 drbd, pacemaker, postgresql. Resource agents, pacemaker, corosync, heartbeat, linstor and a. Prepared by rafael marangoni, from brlink servidor linux team 8. Specifically it manages clusters that use one or more of these components. Integrate drbd with pacemaker clusters on rhel7 centos7. Once corosync and pacemaker are installed, we only need to modify a single configuration file to activate them.
1332 1045 586 1053 1464 475 896 520 524 1451 234 1576 1272 343 1090 212 819 1037 425 1568 1480 152 1404 1552 614 368 404 519 1455 667 612 1275 769 1052 529 992 284 1264 1102 1496 682 1004 1388