How can I remove shutdown Docker Service tasks after a rolling update?

docker containers docker-swarm
Haris Khan picture Haris Khan · Jan 17, 2017 · Viewed 14.8k times · Source

I'm using Docker Swarm to test services on AWS. I recently applied an update to the service like this:

 docker service update --image TestImage:v2 --update-parallelism 2 \
--update-delay 10s TestService2

The update worked as intended, and the service updated the task containers to v2. However a quick docker service ps TestService2 | grep "v1" reveals a bunch of shutdown TestImage:v1 tasks.

a0w77kj0k6jfg4r9g4nz47zzg   \_ TestService2.1   TestImage:v1  W1  Shutdown       Shutdown 36 minutes ago
2of4mc63ekzbib01w3x7q6sdm   \_ TestService2.2   TestImage:v1  W2  Shutdown       Shutdown 37 minutes ago
495frrpza5pxt205o1594x54a   \_ TestService2.3   TestImage:v1  W1  Shutdown       Shutdown 36 minutes ago
57l0gsqd26u2e5gdj30w8mcn9   \_ TestService2.4   TestImage:v1  M1  Shutdown       Shutdown 36 minutes ago
baoe1i79fswb34ydwbpafg6tm   \_ TestService2.5   TestImage:v1  M3  Shutdown       Shutdown 35 minutes ago
3uxi7kwxb73z69km6s17son58   \_ TestService2.6   TestImage:v1  M2  Shutdown       Shutdown 37 minutes ago
99cg4arnt1y52nd8d422bdu49   \_ TestService2.7   TestImage:v1  M3  Shutdown       Shutdown 36 minutes ago
cq5716jqp40h6jugo1j9ilzwp   \_ TestService2.8   TestImage:v1  M1  Shutdown       Shutdown 35 minutes ago
awlz1kxbrjk51dey7frm14d8u   \_ TestService2.9   TestImage:v1  W3  Shutdown       Shutdown 35 minutes ago
4xdi9a1jweyehfqlt76uynf3i   \_ TestService2.10  TestImage:v1  M2  Shutdown       Shutdown 36 minutes ago
eo4t6i0gaj5i294fcdnb3qncq   \_ TestService2.11  TestImage:v1  W3  Shutdown       Shutdown 35 minutes ago
3ydeuxdjquulv5xj94b9ovuwu   \_ TestService2.12  TestImage:v1  W1  Shutdown       Shutdown 36 minutes ago

How can I remove these without going to each individual swarm node and running docker rm on the exited containers? I don't think theres a docker service command to do it, I've looked through the docs, but does anyone know of a hack or script that I can run on a Swarm Manager to clean up the nodes?

Thanks!

Answer

Geige V picture Geige V · Jan 20, 2017

The containers for those services are removed after a rolling update; you are simply left with a log of those that were shutdown.

You can limit the number you see using

docker swarm update --task-history-limit 5

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