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To check the status of the nodes in the cluster pcs status nodesĬorosync-objctl .ġ, Check the configuration for errors, and there still are some crm_verify -L -V
To check the status of the cluster after starting it: pcs status pcs cluster start -allģ, Optionally, depending on requirements, we can enable cluster services to start on boot, pcs cluster enable -all
It’s no longer required to repeat all commands on all the nodes.Īuthorisation tokens are stored in the file /var/lib/pcsd/tokens.ġ, start adding all nodes to a cluster named LDAP-HA-Cluster pcs cluster setup -name LDAP-HA-Cluster dir01 dir02Ģ, After creating the cluster and adding nodes, start cluster packeages from the single poing, it will start pacemaker and corosync in all the nodes. pcs cluster auth dir01 dir02 -u haclusterįrom here, we can control the cluster by using PCS from dir01. Use the previously configured hacluster user and password. Tags: enter|leave|trace1|trace2|trace3|trace4|trace6ĥ, Since we will configure all nodes from one point, we need to authenticate on all nodes before we are allowed to change the configuration. # Load the Pacemaker Cluster Resource Manager (5) # The following is a two-ring multicast configuration. # This specifies the redundant ring protocol, which may be # How many threads to use for encryption/decryption # Limit generated nodeids to 31-bits (positive signed integers) # Stagger sending the node join messages by 1.send_join ms # Number of messages that may be sent by one processor on receipt of the token # How long to wait for consensus to be achieved before starting a new # How long to wait for join messages in the membership protocol (ms) # How many token retransmits before forming a new
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Before we can use PCS, we need to configure public key authentication or give the user a password on all the nodes: echo "hapasswd" | passwd hacluster -stdinģ, Startng pcsd pacemaker manager in all the nodes service pacemaker startĤ, Create new corosync multicast configuration with the below given, vi /etc/corosync/nf By installing the necessary packages, Yum also created a user, hacluster, which can be used together with PCS to do the configuration of the cluster nodes. This allows us to have a single interface to manage all cluster nodes.
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When testing the cluster, we could temporarily disable the firewall to be sure that blocked ports aren’t causing unexpected problems.ġ, Open UDP-ports 54 for Corosync: iptables -I INPUT -m state -state NEW -p udp -m multiport -dports 5404,5405 -j ACCEPTĢ, Open TCP-port 2224 for PCS iptables -I INPUT -p tcp -m state -state NEW -m tcp -dport 2224 -j ACCEPTģ, Allow IGMP-traffic iptables -I INPUT -p igmp -j ACCEPTĤ, Allow multicast-traffic iptables -I INPUT -m addrtype -dst-type MULTICAST -j ACCEPTĥ, Save the changes made in iptables and restart service iptables saveġ, After setting up the basics, we need to install the packages for the components on all the server, yum install corosync pcs pacemaker cmanĢ, To manage the cluster nodes, we will use PCS.
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Start with configuring both cluster nodes with a static IP, a hostname, make sure that they are in the same subnet and can reach each other by nodename.ġ, Local name binding using hosts cat /etc/hostsġ0.0.0.10 ldap-ha Ģ, Disable SELINUX vi /etc/selinux/configģ, Clean update the server yum install clean allīasic Firewall setting for All the nodes in the cluster: Optionally: Cluster manager to easily manange the cluster settings on all nodes (like PCS) Messaging component which is responsible for communication and membership (like Corosync or Heartbeat) Resource manager that can start and stop resources (like Pacemaker) To build this simple cluster, we need a few basic components:
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