# Modify existing service/container configuration

**URL:** <https://forums.suse.com/t/modify-existing-service-container-configuration/2722>\
**Category:** Rancher 1.x\
**Created:** [May 9, 2016, 9:13am UTC](https://forums.suse.com/t/modify-existing-service-container-configuration/2722 "2016-05-09T09:13:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![garjunan](https://avatars.discourse-cdn.com/v4/letter/g/7993a0/32.png) [@garjunan](https://forums.suse.com/u/garjunan)\
**Post date:** [May 9, 2016, 9:13am UTC](https://forums.suse.com/t/modify-existing-service-container-configuration/2722/1 "2016-05-09T09:13:38Z")

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Hi,

Is there any option to modify the existing container/service configuration in Rancher UI like memory/cpu or add/modify environment variable? I know we have option to clone but it is not good practice when we need to update/modify many containers.

Please let me know if any option is available.

Thanks  
Gokul

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**Author:** ![denise](https://avatars.discourse-cdn.com/v4/letter/d/82dd89/32.png) [@denise](https://forums.suse.com/u/denise)\
**Post date:** [May 10, 2016, 5:50am UTC](https://forums.suse.com/t/modify-existing-service-container-configuration/2722/2 "2016-05-10T05:50:30Z")

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Nope, this is actually a Docker restriction. Once a container is started, it can’t be altered. The things that we alter in our UI is something that Rancher manages, not the Docker container.

If you have many services to modify, I’d recommend checking out [rancher-compose](http://docs.rancher.com/rancher/latest/en/rancher-compose/) and using it to [upgrade services](http://docs.rancher.com/rancher/latest/en/rancher-compose/upgrading/).