icm exec
The icm exec command runs an arbitrary command in the specified containers, for example
$ icm exec -command "df -k" -machine ANDY-DM-TEST-0001
Executing command in container iris on ANDY-DM-TEST-0001
...output in ./state/ANDY-DM-TEST/ANDY-DM-TEST-0001/docker.out
Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 10474496 2205468 8269028 22% /
tmpfs 3874116 0 3874116 0% /dev
tmpfs 3874116 0 3874116 0% /sys/fs/cgroup
/dev/xvda2 33542124 3766604 29775520 12% /host
/dev/xvdb 10190100 36888 9612540 1% /irissys/data
/dev/xvdc 10190100 36888 9612540 1% /irissys/wij
/dev/xvdd 10190100 36888 9612540 1% /irissys/journal1
/dev/xvde 10190100 36888 9612540 1% /irissys/journal2
shm 65536 492 65044 1% /dev/shm
Because mixing output from multiple commands would be hard to interpret, when the command is executed on more than one node, the output is written to files and a list of output files provided.
Additional Docker options, such as --env, can be specified on the icm exec command line using the -options option; for more information, see Using ICM with Custom and Third-Party Containers.
Because executing long-running, blocking, or interactive commands within a container can cause ICM to time out waiting for the command to complete or for user input, the icm exec command can also be used in interactive mode. Unless the command is run on a single-node deployment, the -interactive flag must be accompanied by a -role or -machine option restricting the command to a single node. A good example is running a shell in the container:
$ icm exec -command bash -machine ANDY-AM-TEST-0004 -interactive
Executing command 'bash' in container iris on ANDY-AM-TEST-0004...
[root@localhost /] $ whoami
root
[root@localhost /] $ hostname
iris-ANDY-AM-TEST-0004
[root@localhost /] $ exit
Another example of a command to execute interactively within a container is an InterSystems IRIS command that prompts for user input, for example iris stop: which asks whether to broadcast a message before shutting down the InterSystems IRIS instance.
The icm cp command, which copies a local file or directory on the specified node into the specified container, is useful with icm exec.
