vrrp_script; Cannot find script docker in path - disabling about keepalived HOT 3 CLOSED

This might help - https://opensource-db.com/working-with-keepalived-and-selinux-ensuring-ha-and-security/

from keepalived.

As it says, keepalived cannot find the executable docker in the search path; you need to specify the full path name to the docker executable.

Further, keepalived does not manage a pipeline of processes; you need a shell to do that, so you need to create an executable script:

#!/bin/bash

docker ps -q -f name=haproxy | grep -q . && echo 1 || echo 0

and suppose it is /etc/keepalived/ka_docker.sh, then change the line in the vrrp_script block to
script /etc/keepalived/ka_docker.sh

Also, keepalived does not read the stdout of a script that it executes, but retrieves the exit code, so you need to change the script to be:

#!/bin/bash

docker ps -q -f name=haproxy | grep -q . && exit 1 || exit 0

This will exit with 1 (failure) if there is a container with the name haproxy, and 0 (success) if there is no such container. This may be the opposite of what you want.

from keepalived.

Thank you both, but its an issue with Keepalived and SElinux the solution is to use an external script and put it in the specified directory using this guide

https://opensource-db.com/working-with-keepalived-and-selinux-ensuring-ha-and-security/

/usr/libexec/keepalived/

I found setting permissions as chmod u=rwx,g=rx,o=rx /usr/libexec/keepalived/script-name.sh worked for me

This took us days to figure out, so hopefully this will help someone :)

from keepalived.