[SOLVED] hookscripts on container to gracefully start/stop docker images inside containers

[peter70]

I try to execute hookscript.
I successfully added hookscript from documentation /usr/share/pve-docs/examples/guest-example-hookscript.pl and I see it's beeng executed in gui taks log:

GUEST HOOK: 112 pre-start
112 is starting, doing preparations.
GUEST HOOK: 112 post-start
112 started successfully.
TASK OK

So it's working.

Now I want to execute command inside this container so I've added this command inside my hookscript:

system "pct exec 112 -- bash -c 'touch testfile'";

but it's not creating no file inside container 112

How can I run script inside container just before shuting it down or after start?

 

[peter70]

bump, no one is using hookscripts?
It would be awesome to know how to execute script inside container before stop.

 

[fabian]

please post the full hook script..

 

[peter70]

please post the full hook script..

Thank you, I must have made some error because it's working now.

Anyway here's code how to gracefully start/stop docker images inside containers:

#!/usr/bin/perl

# Exmple hook script for PVE guests (hookscript config option)
# You can set this via pct/qm with
# pct set <vmid> -hookscript <volume-id>
# qm set <vmid> -hookscript <volume-id>
# where <volume-id> has to be an executable file in the snippets folder
# of any storage with directories e.g.:
# qm set 100 -hookscript local:snippets/hookscript.pl

use strict;
use warnings;

print "GUEST HOOK: " . join(' ', @ARGV). "\n";

# First argument is the vmid

my $vmid = shift;

# Second argument is the phase

my $phase = shift;

if ($phase eq 'pre-start') {
    # First phase 'pre-start' will be executed before the guest
    # is started. Exiting with a code != 0 will abort the start

    #print "$vmid is starting, doing preparations.\n";

    # print "preparations failed, aborting."
    # exit(1);

} elsif ($phase eq 'post-start') {
    # Second phase 'post-start' will be executed after the guest
    # successfully started.

    #print "$vmid started successfully.\n";
    system "pct exec $vmid -- bash -c 'docker start \$(docker ps -a -q)'";

} elsif ($phase eq 'pre-stop') {

    # Third phase 'pre-stop' will be executed before stopping the guest
    # via the API. Will not be executed if the guest is stopped from
    # within e.g., with a 'poweroff'
    system "pct exec $vmid -- bash -c 'docker stop \$(docker ps -q)'";
    
    print "$vmid will be stopped.\n";

} elsif ($phase eq 'post-stop') {
    # Last phase 'post-stop' will be executed after the guest stopped.
    # This should even be executed in case the guest crashes or stopped
    # unexpectedly.

    #print "$vmid stopped. Doing cleanup.\n";

} else {
    die "got unknown phase '$phase'\n";
}