swarm keepalived

Update VERSION 2.3.1

Keepalived for Linux

keepalived configure flags

• disable-dynamic-linking
• prefix=/usr
• exec-prefix=/usr
• bindir=/usr/bin
• sbindir=/usr/sbin
• sysconfdir=/etc
• datadir=/usr/share
• localstatedir=/var
• mandir=/usr/share/man
• with-dbus-data-dir=/usr/share
• enable-bfd
• enable-dbus
• enable-regex
• enable-snmp
• enable-snmp-rfc
• enable-nftables
• disable-iptables
• enable-json

docker

master

• iface=eth0
• ipaddress=172.16.5.4
• vip=192.168.100.254 192.168.10.254

docker run -d --restart=always \
  --cap-add=NET_ADMIN --cap-add=NET_BROADCAST --cap-add=NET_RAW --net=host \
  -e KEEPALIVED_UNICAST_SRC_IP="172.16.5.4" \
  -e KEEPALIVED_UNICAST_PEER="172.16.5.5, 172.16.5.6" \
  -e KEEPALIVED_VIRTUAL_IPADDRESS="192.168.100.254, 192.168.10.254" \
  -e KEEPALIVED_PRIORITY="200" \
  -e KEEPALIVED_INTERFACE="eth0" \
  ghcr.io/rootshell-coder/swarm-keepalived:latest

docker master log (codespace)

@RootShell-coder ➜ /workspaces/swarm-keepalived/docker (dev) $ docker logs -f 955
Sat Sep 16 19:04:02 2023: Starting Keepalived v2.2.8 (04/04,2023), git commit v2.2.7-154-g292b299e+
Sat Sep 16 19:04:02 2023: WARNING - keepalived was built for newer Linux 6.3.0, running on Linux 5.15.0-1041-azure #48-Ubuntu SMP Tue Jun 20 20:34:08 UTC 2023
Sat Sep 16 19:04:02 2023: Command line: '/usr/sbin/keepalived' '--dont-fork' '--log-console' '--use-file'
Sat Sep 16 19:04:02 2023:               '/etc/keepalived/keepalived.conf'
Sat Sep 16 19:04:02 2023: Configuration file /etc/keepalived/keepalived.conf
Sat Sep 16 19:04:02 2023: NOTICE: setting config option max_auto_priority should result in better keepalived performance
Sat Sep 16 19:04:02 2023: Starting VRRP child process, pid=26
Sat Sep 16 19:04:02 2023: Startup complete
Sat Sep 16 19:04:02 2023: (VI_1) Entering BACKUP STATE (init)
Sat Sep 16 19:04:05 2023: (VI_1) Entering MASTER STATE

@RootShell-coder ➜ /workspaces/swarm-keepalived/docker (dev) $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.16.5.4  netmask 255.255.255.0  broadcast 172.16.5.255
        inet6 fe80::20d:3aff:fe2c:8d4c  prefixlen 64  scopeid 0x20<link>
        ether 00:0d:3a:2c:8d:4c  txqueuelen 1000  (Ethernet)
        RX packets 2183040  bytes 3005950736 (3.0 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 198564  bytes 1551652595 (1.5 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth0:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.100.254  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0d:3a:2c:8d:4c  txqueuelen 1000  (Ethernet)

eth0:1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.254  netmask 255.255.255.255  broadcast 0.0.0.0
        ether 00:0d:3a:2c:8d:4c  txqueuelen 1000  (Ethernet)

backup 0

• iface=eth0
• ipaddress=172.16.5.5
• vip=192.168.100.254 192.168.10.254

docker run -d --restart=always \
  --cap-add=NET_ADMIN --cap-add=NET_BROADCAST --cap-add=NET_RAW --net=host \
  -e KEEPALIVED_UNICAST_SRC_IP="172.16.5.5" \
  -e KEEPALIVED_UNICAST_PEER="172.16.5.4, 172.16.5.6" \
  -e KEEPALIVED_VIRTUAL_IPADDRESS="192.168.100.254, 192.168.10.254" \
  -e KEEPALIVED_PRIORITY="100" \
  -e KEEPALIVED_INTERFACE="eth0" \
  ghcr.io/rootshell-coder/swarm-keepalived:latest

backup 1

• iface=enp3s0
• ipaddress=172.16.5.6
• vip=192.168.100.254

docker run -d --restart=always \
  --cap-add=NET_ADMIN --cap-add=NET_BROADCAST --cap-add=NET_RAW --net=host \
  -e KEEPALIVED_UNICAST_SRC_IP="172.16.5.6" \
  -e KEEPALIVED_UNICAST_PEER="172.16.5.4, 172.16.5.5" \
  -e KEEPALIVED_VIRTUAL_IPADDRESS="192.168.100.254" \
  -e KEEPALIVED_PRIORITY="50" \
  -e KEEPALIVED_INTERFACE="enp3s0" \
  ghcr.io/rootshell-coder/swarm-keepalived:latest

Variables

variable	default	required
KEEPALIVED_INTERFACE	eth0	X
KEEPALIVED_VIRTUAL_ROUTER_ID	51	X
KEEPALIVED_PRIORITY	100	X
KEEPALIVED_AUTH_PASS	ETlE2RQr	X
KEEPALIVED_UNICAST_SRC_IP	X	Y
KEEPALIVED_UNICAST_PEER	X	Y
KEEPALIVED_VIRTUAL_IPADDRESS	X	Y

Example

docker swarm service see keepalived-service.yml

deploy to swarm cluster

• wget https://raw.githubusercontent.com/RootShell-coder/swarm-keepalived/master/keepalived-service.yml
• edit variables keepalived-service.yml
• <label> add labels to cluster manager nodes: keepalived_master=tue, keepalived_backup0=true, keepalived_backup1=true
• <node> see cluster nodes docker node ls
• docker node update --label-add <label> <node>
• docker stack deploy -c keepalived-service.yml keepalived

docker service see docker-compose.yml