Pacemaker : Set Cluster Resource (httpd)

Set Apache httpd Cluster Resource and Configure Active/Passive Web Server. This example is based on the environment like follows.   1) Basic Cluster setting is done   2) Fence Device is configured   3) LVM shared storage is configured +--------------------+ | [ ISCSI Target ] | | dlp.srv.world | +----------+---------+ 10.0.0.30| | +----------------------+ | +----------------------+ | [ Cluster Node#1 ] |10.0.0.51 | 10.0.0.52| [ Cluster Node#2 ] | | node01.srv.world +----------+----------+ node02.srv.world | | Apache httpd | | | Apache httpd | +----------------------+ | +----------------------+ vip:10.0.0.60 | +----------+---------+ | [ Clients ] | | | +--------------------+

[1]	On all Cluster Nodes, Install Apache httpd.

[root@node01 ~]#  dnf -y install httpd [root@node01 ~]#  vi /etc/httpd/conf.d/server-status.conf # create new (enable server-status) <Location /server-status> SetHandler server-status Require local </Location> [root@node01 ~]#  vi /etc/logrotate.d/httpd # line 9 : change like follows /var/log/httpd/*log { missingok notifempty sharedscripts delaycompress postrotate #/bin/systemctl reload httpd.service > /dev/null 2>/dev/null || true /usr/sbin/httpd -f /etc/httpd/conf/httpd.conf -c "PidFile /var/run/httpd/httpd.pid" -k graceful > /dev/null 2>/dev/null || true endscript } # if Firewalld is running, allow service [root@node01 ~]#  firewall-cmd --add-service={http,https} success [root@node01 ~]#  firewall-cmd --runtime-to-permanent success

[2]	On a Node that LVM shared storage is active in Cluster, Copy httpd files and create a Test page. [/dev/vg_ha/lv_ha] on the example below is LVM shared storage.

[root@node01 ~]#  mount /dev/vg_ha/lv_ha /mnt [root@node01 ~]#  cp -pR /var/www/* /mnt/ [root@node01 ~]#  echo "High Availability Test Page" > /mnt/html/index.html [root@node01 ~]#  umount /mnt

[3]	On a Node that LVM shared storage is active in Cluster, Add httpd resource. [/dev/vg_ha/lv_ha] on the example below is LVM shared storage.

# create filesystem resource [root@node01 ~]#  pcs resource create httpd_fs ocf:heartbeat:Filesystem device=/dev/vg_ha/lv_ha directory=/var/www fstype=ext4 --group ha_group # create virtual IP address resource [root@node01 ~]#  pcs resource create httpd_vip ocf:heartbeat:IPaddr2 ip=10.0.0.60 cidr_netmask=24 --group ha_group # create Apache resource [root@node01 ~]#  pcs resource create website ocf:heartbeat:apache configfile=/etc/httpd/conf/httpd.conf statusurl=http://127.0.0.1/server-status --group ha_group [root@node01 ~]#  pcs status Cluster name: ha_cluster Cluster Summary: * Stack: corosync * Current DC: node01.srv.world (version 2.1.2-4.el9-ada5c3b36e2) - partition with quorum * Last updated: Fri Mar 25 10:50:40 2022 * Last change: Fri Mar 25 10:50:33 2022 by root via cibadmin on node01.srv.world * 2 nodes configured * 5 resource instances configured Node List: * Online: [ node01.srv.world node02.srv.world ] Full List of Resources: * scsi-shooter (stonith:fence_scsi): Started node01.srv.world * Resource Group: ha_group: * lvm_ha (ocf:heartbeat:LVM-activate): Started node01.srv.world * httpd_fs (ocf:heartbeat:Filesystem): Started node01.srv.world * httpd_vip (ocf:heartbeat:IPaddr2): Started node01.srv.world * website (ocf:heartbeat:apache): Started node01.srv.world Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled # if SELinux is enabled, run restorecon on active Node [root@node01 ~]#  restorecon -R /var/www # access to vip to verify working [root@node01 ~]#  curl http://10.0.0.60/index.html High Availability Test Page