Auto starting

Selected containers can be chosen to be started when osctld imports its pool. Since osctld is automatically importing all active pools when it starts as the host system boots up, it effectively starts those containers together with the host node.

Containers are not started automatically by default, it must be explicitly enabled using osctl ct set autostart per container:

osctl ct set autostart myct01

Its settings can then be verified e.g. with osctl ct show:

osctl ct show -o autostart,autostart_priority,autostart_delay myct01
          AUTOSTART:  true
 AUTOSTART_PRIORITY:  10
    AUTOSTART_DELAY:  5

AUTOSTART_PRIORITY determines the order in which containers are started. 0 is the highest priority, higher numbers have lower priority. Containers with higher priority are started first. AUTOSTART_DELAY signifies how many seconds should osctld wait, before starting another container, thus giving the container time to start, or at least dampen the load. Autostart priority defaults to 10 and delay to 5 seconds.

Both parameters can be changed:

osctl ct set autostart --priority 5 --delay 10 myct01

osctl ct show -o autostart,autostart_priority,autostart_delay myct01
          AUTOSTART:  true
 AUTOSTART_PRIORITY:  5
    AUTOSTART_DELAY:  10

The container was given higher priority and its start time prolonged to 10 seconds.

Auto start queue

When the auto start process is in progress, it is possible to monitor its progress. osctl ct pool autostart queue will list the queue of containers that are about to be started.

osctl pool autostart queue tank
ID       PRIORITY   DELAY 
myct02   10         5     
myct03   10         5     
myct04   10         5     
myct05   10         5     
myct06   10         5

The current auto start process can be aborted using osctl pool autostart cancel:

osctl ct autostart cancel tank

osctl pool autostart queue tank
# the queue is empty

The auto start process can be manually started using osctl pool autostart trigger:

osctl pool autostart trigger tank

osctl pool autostart queue tank
ID       PRIORITY   DELAY 
myct02   10         5     
myct03   10         5     
myct04   10         5     
myct05   10         5     
myct06   10         5

Disabling auto starting

To persistently prevent a container from being started automatically on pool import, you can use osctl ct unset autostart:

osctl ct unset autostart myct01

osctl ct show -o autostart,autostart_priority,autostart_delay myct01
          AUTOSTART:  -
 AUTOSTART_PRIORITY:  -
    AUTOSTART_DELAY:  -

It is also possible to temporarily skip the auto start process when importing a pool into osctld:

osctl pool import --no-autostart tank

The auto start process can be later trigger manually using osctl pool autostart trigger.