lisk-node-failover.md

Rename network interface to eth0

If you can, you make your live easier by renaming the network interface (first cable network) to eth0. See https://askubuntu.com/a/801310

Install and configure heartbeat (all nodes)

$ sudo apt-get install -y heartbeat
$ sudo touch /etc/ha.d/authkeys
$ sudo chmod 600 /etc/ha.d/authkeys

Edit /etc/ha.d/authkeys using a custom password (e.g from cat /dev/urandom | head -c 256 | sha1sum | cut -d' ' -f1)

auth1
1 sha1 1c441077edc8069ff9a09ed9ee1cbab20469d1ec

Collect node information

On every node collect

• node name (e.g. "my-hostname1"),
• interface name (e.g. "enp0s3") and
• ip address (e.g. "192.168.178.111")

using the commands

$ uname -n
my-hostname1
$ ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.178.111  netmask 255.255.255.0  broadcast 192.168.178.255
        inet6 aaaa::bbbb:cccc:dddd:eeee  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:b8:51:7c  txqueuelen 1000  (Ethernet)
        RX packets 871002  bytes 198840987 (198.8 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1068552  bytes 171399127 (171.3 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 132092  bytes 91557087 (91.5 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 132092  bytes 91557087 (91.5 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Edit /etc/ha.d/ha.cf on both nodes (same content except the interface name), e.g.:

auto_failback on

node my-hostname1
ucast enp0s3 192.168.178.111
node my-hostname2
ucast enp0s3 192.168.178.105

and

auto_failback on

node my-hostname1
ucast ens1 192.168.178.111
node my-hostname2
ucast ens1 192.168.178.105