Differences

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--- high_availability_virtualization_cluster [2013/08/30 11:59] – dodger
+++ linux:high_availability_virtualization_cluster [2018/04/17 09:08] – dodger
@@ Line 1: / Line 1: @@
+====== [HOWTO] Linux KVM cluster ======
 ====== Description ======
 Instructions on how to deploy a high availability KVM cluster based on CentOS 6.x
@@ Line 4: / Line 6: @@
 ====== Instructions ======
+===== RHEL cluster =====
   * Deploy Centos (minimal)
   * Enjoy with basic networking.
@@ Line 24: / Line 27: @@
 <code bash>yum groupinstall "High Availability Management"
 </code>
-  * Change the password for "ricci" user:
+  * Change the password for "ricci" user (all nodes):
 <code bash>passwd ricci</code>
   * Configure services:
@@ Line 36: / Line 39: @@
 <code bash>
 service ricci start
-service luci start
 service cman start
 </code>
+  * Start luci on admin node:
+<code bash>service luci start</code>
 If luci refuses to start, read the [[high_availability_virtualization_cluster#Troubleshoot|troubleshoot]] section.
-  * Access the luci UI or Conga formatively (the url is displayed after staring luci).
   * Disable NetworkManager:
 <code bash>
@@ Line 84: / Line 87: @@
 GATEWAY=10.54.0.1
 </code>
+  * Enable forwarding on bridges on iptables:
+<code bash>
+iptables -A FORWARD -m physdev --physdev-is-bridged -j ACCEPT
+</code>
+  Or disable iptables (if you have a good firewall):
+<code bash>
+service iptables stop
+chkconfig iptables off
+</code>
+  * Enable forwarding on the kernel:
+<code bash>
+inet.ipv4.ip_forward = 1
+sysctl -p /etc/sysctl.conf
+</code>
+  * Access the luci UI or Conga formatively (the url is displayed after staring luci, something like https://admin_node:8084/) and create the cluster.
+  * Define some Fence method for each node.
+  * I suppose you've exported some volume from your storage system to all the servers and you've setted up multipathd (or whatever) so you can see the volume under ''/dev/mapper''.
+  * Create the partition on the disk:
+<code bash>
+parted /dev/mapper/SHAREDDISK
+(parted) mklabel gpt
+(parted) mkpart primary ext2 0 9999999G
+(parted) set 1 lvm on
+(parted) quit
+</code>
+  * Create the lvm on the new partition:
+<code bash>pvcreate /dev/mapper/SHAREDDISKp1
+vgcreate --clustered y SHAREDVG /dev/mapper/SHAREDDISKp1
+</code>
+  * On the rest of the nodes (I didn't needed it, but Its safer to run it):
+<code bash>
+partprobe; vgscan
+</code>
+  * Create the LVM volume:
+<code bash>lv create -L 9999999G -n SHARED_LV SHAREDVG
+</code>
+  * And create the GFS2:
+<code bash> mkfs.gfs2 -p lock_dlm -t CLUSTERNAME:SHAREDVOLUME -j 4 /dev/mapper/SHAREDVG-SHARED_LV
+</code>
+  * Add the new filesystem to fstab (**MANDATORY**) on all the nodes:
+<code bash>
+# GFS
+/dev/mapper/SHAREDVG-SHARED_LV            /mnt/shared_storage         gfs2    noatime         0 0
+# GFS
+</code>
+  * Mount it
+===== KVM =====
+  * Install the dependencies:
-chkconfig iptables off && service iptables stop
+<code bash> yum groupinstall "Virtualization Platform" "Virtualization Tools" Virtualization "Virtualization Client"
+</code>
+  * More deps for virt-manager:
+<code bash>
+yum install dejavu-lgc-sans-fonts
+</code>