Keepalived : Install2023/08/24 |
Install Keepalived that uses VRRP (Virtual Router Redundancy Protocol) to build redundant configuration.
This example is based on the environment like follows. VIP:10.0.0.30 +----------------------+ | +----------------------+ | [node01.srv.world] |10.0.0.51 | 10.0.0.52| [node02.srv.world] | | Keepalived#1 +----------+----------+ Keepalived#2 | | | | | +----------------------+ +----------------------+ |
[1] | Install Keepalived on all Nodes. |
root@node01:~# apt -y install keepalived
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[2] | Configure Keepalived on the Primary Node. |
root@node01:~#
vi /etc/keepalived/keepalived.conf # create new global_defs { # set hostname router_id node01 } vrrp_instance VRRP1 { # on primary node, specify [MASTER] # on backup node, specify [BACKUP] # if specified [BACKUP] + [nopreempt] on all nodes, automatical failback is disabled state MASTER # if you like disable automatical failback, set this value with [BACKUP] # nopreempt # network interface virtual IP address is assigned interface enp1s0 # set unique ID on each VRRP interface # on the a VRRP interface, set the same ID on all nodes virtual_router_id 101 # set priority : [Master] > [BACKUP] priority 200 # VRRP advertisement interval (sec) advert_int 1 # virtual IP address virtual_ipaddress { 10.0.0.30/24 } }
root@node01:~#
root@node01:~# systemctl restart keepalived ip address show enp1s0 2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether 52:54:00:5b:6d:b6 brd ff:ff:ff:ff:ff:ff inet 10.0.0.51/24 brd 10.0.0.255 scope global enp1s0 valid_lft forever preferred_lft forever inet 10.0.0.30/24 scope global secondary enp1s0 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fe5b:6db6/64 scope link valid_lft forever preferred_lft forever |
[3] | Configure Keepalived on the Backup Node. |
root@node02:~#
vi /etc/keepalived/keepalived.conf
# create new
global_defs {
router_id node02
}
vrrp_instance VRRP1 {
state BACKUP
# nopreempt
interface enp1s0
virtual_router_id 101
priority 100
advert_int 1
virtual_ipaddress {
10.0.0.30/24
}
}
systemctl restart keepalived
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[4] | That's OK. Verify failover and failback. |
# set link down on primary node root@node01:~# ip address show enp1s0 2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether 52:54:00:5b:6d:b6 brd ff:ff:ff:ff:ff:ff inet 10.0.0.51/24 brd 10.0.0.255 scope global enp1s0 valid_lft forever preferred_lft forever inet 10.0.0.30/24 scope global secondary enp1s0 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fe5b:6db6/64 scope link valid_lft forever preferred_lft foreverroot@node01:~# ip link set down enp1s0
# on backup node root@node02:~# ip address show enp1s0
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:17:b6:c0 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.52/24 brd 10.0.0.255 scope global enp1s0
valid_lft forever preferred_lft forever
inet 10.0.0.30/24 scope global secondary enp1s0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe17:b6c0/64 scope link
valid_lft forever preferred_lft forever
# virtual IP address is assigned
# set link up on primary node root@node01:~# ip link set up enp1s0 root@node01:~# ip address show enp1s0
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 52:54:00:5b:6d:b6 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.51/24 brd 10.0.0.255 scope global enp1s0
valid_lft forever preferred_lft forever
inet 10.0.0.30/24 scope global secondary enp1s0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe5b:6db6/64 scope link
valid_lft forever preferred_lft forever
# failback automatically
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