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--- linux:skoleni:ha [2015/02/26 01:34]
admin
+++ linux:skoleni:ha [2016/12/05 15:30] (current)
admin
@@ Line 1: / Line 1: @@
+====== HA - basics ======
 Note: Fibre channel - cheap stuff!!!
@@ Line 20: / Line 21: @@
 Install DRBD:
-  [root@node1 ~]# yum -y install drbd83-utils kmod-drbd83
+  [root@node1 ~]# yum -y install drbd84-utils kmod-drbd84
-  [root@node2 ~]# yum -y install drbd83-utils kmod-drbd83
+  [root@node2 ~]# yum -y install drbd84-utils kmod-drbd84
 Insert drbd module manually on both machines or reboot:
@@ Line 27: / Line 28: @@
   /sbin/modprobe drbd
-Partition DRBD on both machines:
+====Partition DRBD on both machines (the ugly way):====
+If your linux box doesn't detect new disk automaticly, you can try rescanning the scsi bus
+   echo "- - -" >/sys/class/scsi_host/host0/scan
   [root@node1 ~]# fdisk -cu /dev/sdb
   [root@node2 ~]# fdisk -cu /dev/sdb
+and the right way:
+  [root@node1 ~]# lvcreate -L 4GB -n mail_disk vg_jahoda
+  [root@node2 ~]# lvcreate -L 4GB -n mail_disk vg_boruvka
+==== Setup the network ====
+<file bash ifcfg-eth1>
+DEVICE="eth1"
+BOOTPROTO="none"
+HWADDR="00:0C:29:DA:26:E9"
+IPADDR="10.1.1.1"
+NETMASK="255.255.255.252"
+IPV6INIT="yes"
+NM_CONTROLLED="no"
+ONBOOT="yes"
+TYPE="Ethernet"
+</file>
+==== DRBD config ====
+<code bash>
+resource mail_disk {
+ protocol C;
+ startup {
+	 wfc-timeout 30;
+	 outdated-wfc-timeout 20;
+	 degr-wfc-timeout 30;
+ }
+net {
+	 cram-hmac-alg sha1;
+	 shared-secret sync_disk;
+ }
+syncer {
+	 rate 100M;
+	 al-extents 257;
+	 on-no-data-accessible io-error;
+ }
+on node1 {
+	 device /dev/drbd0;
+	 disk /dev/jahoda/mail;
+	 address 10.1.1.1:7788;
+	 flexible-meta-disk internal;
+ }
+on node2 {
+	 device /dev/drbd0;
+	 disk /dev/boruvka/mail;
+	 address 10.1.1.2:7788;
+	 meta-disk internal;
+ }
+}
+</code>
+Initialize devices (very similar to pvcreate or mkfs.ext4):
+  [root@node1 ~]# drbdadm create-dm mail_disk
+  [root@node2 ~]# drbdadm create-dm mail_disk
+It is time to start the services. And be careful Jimm, you have 30 seconds to start both.
+  [root@node1 ~]# service drbd restart
+  [root@node2 ~]# /etc/init.d/drbd restart
+Check ''cat /proc/drbd'', we should be both Secondary/Secondary and data Inconsistent/Inconsistent. The rest is garbage for geeks.
+<code>
+version: 8.4.5 (api:1/proto:86-101)
+GIT-hash: 1d360bde0e095d495786eaeb2a1ac76888e4db96 build by phil@Build64R6, 2014-10-28 10:32:53
+: cs:Connected ro:Secondary/Secondary ds:Diskless/Inconsistent C r-----
+    ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0
+</code>
+Careful reader could have notices we are having Diskless/Inconsistent. Initialize (create-dm) the disk again or zero it (dd if=/dev/zero) and initialize again and thing should be fine.
+  [root@node1 ~]# drbdadm -- --overwrite-data-of-peer primary mail_disk
+====== UCARP (VRRP) ======
+Open the page and install epel
+http://mirror.hosting90.cz/epel/6/x86_64/repoview/epel-release.html
+Or try using this direct link, but might be unavailable later
+   yum install http://mirror.hosting90.cz/epel/6/x86_64/epel-release-6-8.noarch.rpm
+Install ucarp
+   yum install ucarp
+config
+<file bash /etc/ucarp.d/vip-001.conf>
+  VIP_ADDRESS="192.168.5.123"
+</file>
+<file bash /etc/ucarp.d/vip-common.conf>
+PASSWORD="love"
+BIND_INTERFACE="eth0"
+SOURCE_ADDRESS="192.168.5.39"
+# If you have extra options to add, see "ucarp --help" output
+OPTIONS="--shutdown --preempt"
+</file>
-drbdadm -- --overwrite-data-of-peer primary repdata
-drbdadm -- --overwrite-data-of-peer primary repdata

linux/skoleni/ha.1424910860.txt.gz · Last modified: 2015/02/26 01:34 by admin