Installing multiple applications on the same server is supported but not recommended by Atlassian. Check out the pros and cons here: https://confluence.atlassian.com/confeval/other-atlassian-evaluator-resources/server-installing-multiple-applications-on-a-single-server
Since you're considering Docker have look at the images publicly available: https://hub.docker.com/u/atlassian
Please consider evaluating the 4 apps in one machine first, before rolling out everything in production. Also, forecast well the future number of users as this may require a different infrastructure set-up in the future.
I’m Serhat Can, Technical Evangelist at Atlassian and the author of “On Call”. I’ve spent years participating in and helping customers build on-call programs. I recently compiled all my insights into...
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