# Sunstone doesn't start after update to 5.10

**URL:** <https://forum.opennebula.io/t/sunstone-doesnt-start-after-update-to-5-10/7878>\
**Category:** Installation & Configuration\
**Created:** [November 28, 2019, 4:53pm UTC](https://forum.opennebula.io/t/sunstone-doesnt-start-after-update-to-5-10/7878 "2019-11-28T16:53:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Leonid](https://avatars.discourse-cdn.com/v4/letter/l/d9b06d/32.png) [@Leonid](https://forum.opennebula.io/u/Leonid)\
**Post date:** [November 28, 2019, 4:53pm UTC](https://forum.opennebula.io/t/sunstone-doesnt-start-after-update-to-5-10/7878/1 "2019-11-28T16:53:27Z")

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Hi guys,

After update to 5.10 while starting sunstone service I got the error:

> ruby[266052]: /usr/share/rubygems/rubygems/core\_ext/kernel\_require.rb:55:in `require': cannot load such file -- rack/session/dalli (LoadError) ruby[266052]: from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:55:in `require’  
> ruby[266052]: from /usr/lib/one/sunstone/sunstone-server.rb:168:in `’  
> systemd[1]: opennebula-sunstone.service: main process exited, code=exited, status=1/FAILURE  
> systemd[1]: Unit opennebula-sunstone.service entered failed state.

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**Author:** ![vholer](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/vholer/32/4392_2.png) [@vholer](https://forum.opennebula.io/u/vholer)\
**Post date:** [November 28, 2019, 5:40pm UTC](https://forum.opennebula.io/t/sunstone-doesnt-start-after-update-to-5-10/7878/2 "2019-11-28T17:40:28Z")

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Hi @Leonid,

please see -  
[http://docs.opennebula.org/5.10/deployment/opennebula\_installation/frontend\_installation.html#step-4-ruby-runtime-installation-optional](http://docs.opennebula.org/5.10/deployment/opennebula_installation/frontend_installation.html#step-4-ruby-runtime-installation-optional).

We didn’t install gem for `dalli` in the past, so it’s also not bundled now with OpenNebula (maybe something to consider). You can fix the problem by

- switching Sunstone to `:sessions: memcache` or
- installing missing gem, e.g.:

```auto
export GEM_PATH=/usr/share/one/gems/
export GEM_HOME=/usr/share/one/gems/
gem install --no-document --conservative dalli

```

Best,  
Vlastimil

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<div class="post-metadata">

**Author:** ![Leonid](https://avatars.discourse-cdn.com/v4/letter/l/d9b06d/32.png) [@Leonid](https://forum.opennebula.io/u/Leonid)\
**Post date:** [November 29, 2019, 9:31am UTC](https://forum.opennebula.io/t/sunstone-doesnt-start-after-update-to-5-10/7878/3 "2019-11-29T09:31:39Z")

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Hi Vlastimil,

I switched sunstone to `:sessions: memcache` and it started to work.

Thank you very much!