How to run multiple commands in kubernetes cron job

Question

I am trying to run multiple commands in a K8s cron job. However, only the first jobs output is showing in the logs. I have this:

          containers:
          - name: myjob
            image: postgres 
            args:
            - /bin/sh
            - -c
            - PGPASSWORD=$(echo $password) psql -h $host -p 5432 -U $username -d $db -c "\copy (select * from blah limit 1) to blah.txt" ; echo bar.txt ; cat bar.txt;
            - PGPASSWORD=$(echo $password) psql -h $host -p 5432 -U $username -d $db -c "\copy (select * from foo limit 1) to foo.txt" ; date ; echo foo.txt ; cat foo.txt;
          restartPolicy: OnFailure

I am only seeing the output from the first command. I would like to be able to specify multiple commands and run them one by one.

Anton Matsiuk · Answer 1 · 2020-04-15T07:13:56.670

0

just join them in a single line after -c with && or ; operator

See the complete answer here

edited Apr 15 '20 at 07:13

answered Apr 14 '20 at 15:56

Anton Matsiuk

101
2

Since the `-c` appears separately from every other line, perhaps an updated example would be helpful? – Jeff Schaller Apr 14 '20 at 16:34
1

The `&&` is only the answer in case your first command is always successful. If that is not always the case, then the second command might not run at all. – Alex Apr 14 '20 at 16:52
@Alex in the case you want both no matter what, use `;` – D. Ben Knoble Apr 14 '20 at 22:08

score 0 · Answer 2 · answered Apr 15 '20 at 07:44

Just can run two commands by a standard procedure in Pod.

command: ["/bin/sh","-c"]
args: ["command one; command two && command three"]

However, I doubt it is a good idea and it should be used as last hope. Containers are designed to run only one process and CronJobs use Pod specification.

Hence, I can recommend the following things. Order matters.

Run two separate CronJobs if your tasks are completely independent.
Run two separate containers in CronJob. The CronJob will fail, if one of your containers fail.
Use initContainers to achieve some order or preparation before.

How to run multiple commands in kubernetes cron job

2 Answers2