linux - docker attach vs lxc-attach -


update: docker 0.9.0 use libcontainer now, diverting lxc see: attaching process docker libcontainer container

i'm running istance of elasticsearch:

docker run -d -p 9200:9200 -p 9300:9300 dockerfile/elasticsearch

checking process show following:

$ docker ps --no-trunc container id                                                       image                             command                                           created             status              ports                                            names 49fdccefe4c8c72750d8155bbddad3acd8f573bf13926dcaab53c38672a62f22   dockerfile/elasticsearch:latest   /usr/share/elasticsearch/bin/elasticsearch java   hour ago   8 minutes        0.0.0.0:9200->9200/tcp, 0.0.0.0:9300->9300/tcp   pensive_morse

now, when try attach running container, stacked:

$  sudo docker attach 49fdccefe4c8c72750d8155bbddad3acd8f573bf13926dcaab53c38672a62f22 [sudo] password lsoave:

the tty doesn't connect , prompt not back. doing same lxc-attach works fine:

$ sudo lxc-attach -n 49fdccefe4c8c72750d8155bbddad3acd8f573bf13926dcaab53c38672a62f22 root@49fdccefe4c8:/# ps -ef uid        pid  ppid  c stime tty          time cmd root         1     0 49 20:37 ?        00:00:20 /usr/bin/java -xms256m -xmx1g -xss256k -djava.awt.headless=true -xx:+useparnewgc -xx:+useconcma root        88     0  0 20:38 ?        00:00:00 /bin/bash root        92    88  0 20:38 ?        00:00:00 ps -ef root@49fdccefe4c8:/#

does know what's wrong docker attach ?

nb. dockerfile/elasticsearch ends with:

entrypoint ["/usr/share/elasticsearch/bin/elasticsearch"]

you're attaching container running elasticsearch isn't interactive command. don't shell type in because container not running shell. reason lxc-attach works because it's giving default shell. per man lxc-attach:

if no command specified, current default shell of user running lxc-attach looked inside container , executed. fail if no such user exists inside container or container not have working nsswitch mechanism.

docker attach behaving expected.


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