66 lines
2.2 KiB
Bash
Executable file
66 lines
2.2 KiB
Bash
Executable file
#!/bin/bash
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# Use this script to run one-off commands inside a container of a pod where your
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# Python application code lives in.
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# You can accomplish the same results by using regular commands from OpenShift.
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# This script is just wrapping calls to `osc` to make it a little more
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# convenient to use. In the future, the `osc` cli tool might incorporate changes
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# that make this script obsolete.
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# Here is how you would run a command in a pod specified by label [1]:
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#
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# 1. Inpect the output of the command below to find the name of a pod that
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# matches a given label:
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#
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# osc get pods -l <your-label-selector>
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#
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# 2. Open a bash shell in the pod of your choice:
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#
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# osc exec -p <pod-name> -it -- bash
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#
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# 3. Because of how `kubectl exec` and `osc exec` work right now [2], your
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# current working directory is root (/). Change it to where your code lives:
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#
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# cd $HOME
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#
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# 4. Because of how the images produced with CentOS and RHEL work currently [3],
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# you need to manually enable any Software Collections you need to use:
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#
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# source scl_source enable python33
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#
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# 5. Finally, execute any command that you need and exit the shell.
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#
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# Related GitHub issues:
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# [1] https://github.com/GoogleCloudPlatform/kubernetes/issues/8876
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# [2] https://github.com/GoogleCloudPlatform/kubernetes/issues/7770
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# [3] https://github.com/openshift/origin/issues/2001
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# You can use this wrapper like this:
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#
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# ./run-in-container.sh ./manage.py migrate
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# ./run-in-container.sh ./manage.py createsuperuser
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# ./run-in-container.sh tail -f access.log
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#
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# If your Python pods are labeled with a name other than "django", you can use:
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#
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# POD_NAME=something ./run-in-container.sh ./manage.py check
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#
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# You can also specify a POD by index:
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#
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# POD_INDEX=1 ./run-in-container.sh tail -f access.log
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#
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# Or both together:
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#
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# POD_NAME=frontend POD_INDEX=2 ./run-in-container.sh tail -f access.log
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# Get name of a currently deployed pod by label and index
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POD_INSTANCE_NAME=`osc get pods \
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-l "name=${POD_NAME:-django}" \
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-t "{{ with index .items ${POD_INDEX:-0} }}{{ .metadata.name }}{{ end }}"`
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# Run command in a container of the specified pod:
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osc exec -p "$POD_INSTANCE_NAME" -it -- bash -c \
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"cd \$HOME && source scl_source enable python33 && ${@:-echo}"
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