Martin Bydzovsky created MESOS-4279:
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Summary: Graceful restart of docker task
Key: MESOS-4279
URL: https://issues.apache.org/jira/browse/MESOS-4279
Project: Mesos
Issue Type: Bug
Components: containerization, docker
Affects Versions: 0.25.0
Reporter: Martin Bydzovsky
I'm implementing a graceful restarts of our mesos-marathon-docker setup and I
came to a following issue:
(it was already discussed on https://github.com/mesosphere/marathon/issues/2876
and guys form mesosphere got to a point that its probably docker containerizer
problem...)
To sum it up:
When i deploy simple python script to all mesos-slaves:
{code}
#!/usr/bin/python
from time import sleep
import signal
import sys
import datetime
def sigterm_handler(_signo, _stack_frame):
print "got %i" % _signo
print datetime.datetime.now().time()
sys.stdout.flush()
sleep(2)
print datetime.datetime.now().time()
print "ending"
sys.stdout.flush()
sys.exit(0)
signal.signal(signal.SIGTERM, sigterm_handler)
signal.signal(signal.SIGINT, sigterm_handler)
try:
print "Hello"
i = 0
while True:
i += 1
print datetime.datetime.now().time()
print "Iteration #%i" % i
sys.stdout.flush()
sleep(1)
finally:
print "Goodbye"
{code}
and I run it through Marathon like
{code:javascript}
data = {
args: ["/tmp/script.py"],
instances: 1,
cpus: 0.1,
mem: 256,
id: "marathon-test-api"
}
{code}
During app restart I get expected result - task receives sigterm and dies
peacefully (during my script-specified 2 seconds)
But when i wrap this python script in docker:
{code}
FROM node:4.2
RUN mkdir /app
ADD . /app
WORKDIR /app
ENTRYPOINT []
{code}
and run appropriate application by Marathon:
{code:javascript}
data = {
args: ["./script.py"],
container: {
type: "DOCKER",
docker: {
image: "bydga/marathon-test-api"
},
forcePullImage: yes
},
cpus: 0.1,
mem: 256,
instances: 1,
id: "marathon-test-api"
}
{code}
The task during restart (issued from marathon) dies immediately without a
chance to do any cleanup.
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