How to write a bash script which automate entering "docker container" and doing other things?

Question

I want to implement an automatic bash script which enters a running docker container, and do some stuffs:

# cat docker.sh
#!/bin/bash -x

docker exec -it hammerdb_net8 bash
cd /data/oracle/tablespaces/
pwd

Executing the script on terminal:

# ./docker.sh
+ docker exec -it hammerdb_net8 bash
[root@npar1 /]#

The output shows only login the docker container, but won't do other operations.

Is there any method to automate entering docker container and doing other things?

anubhava · Accepted Answer · 2016-02-22 07:40:56Z

5

You can use bash -c:

docker exec -it hammerdb_net8 bash -c 'cd /data/oracle/tablespaces/; pwd; ls'

For running a series of commands use here-doc in BASH:

docker exec -i hammerdb_net8 bash <<'EOF'
cd /data/oracle/tablespaces/
pwd
ls
EOF

answered Feb 22, 2016 at 7:35

anubhava

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3 Comments

Is there any difference between "docker ... bash <<'EOF'" and "docker ... bash <<EOF"?

Using 'EOF' makes all the lines not subjected to parameter expansion so e.g. you can use p=$PWD and $PWD will not be expanded in current shell.

Could you give an example?