# Can't Update to Sensu Core 1.9.0-1 for Migrating to Sensu-Go

**URL:** <https://discourse.sensu.io/t/cant-update-to-sensu-core-1-9-0-1-for-migrating-to-sensu-go/2324>\
**Category:** Sensu Classic (EOL)\
**Created:** [December 2, 2020, 7:54pm UTC](https://discourse.sensu.io/t/cant-update-to-sensu-core-1-9-0-1-for-migrating-to-sensu-go/2324 "2020-12-02T19:54:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![D\_Lasa](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.sensu.io/d_lasa/32/502_2.png) [@D\_Lasa](https://discourse.sensu.io/u/D_Lasa)\
**Post date:** [December 2, 2020, 7:54pm UTC](https://discourse.sensu.io/t/cant-update-to-sensu-core-1-9-0-1-for-migrating-to-sensu-go/2324/1 "2020-12-02T19:54:17Z")

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**Please fill out this template for all topics in this category. Make sure to [read the docs](https://docs.sensu.io/) before asking your question. Remember that this those helping you are volunteers. Be kind and follow this template :-).**

**1. What have you already tried? Please include links to gists and/or code blocks (if relatively small)**

- “https ://sensu . io/blog/announcing-the-sensu-archives”
- “https ://discourse.sensu . io/t/action-required-upcoming-changes-to-sensu-1-x-package-repository-configuration/1433”
- “https ://docs.sensu . io/sensu-core/latest/installation/upgrading/#sensu-core”
- Tried  
‘’‘apt-get --only-upgrade install sensu’’’  
‘’‘echo ‘deb http ://repositories.sensuapp . org/apt sensu main’ \> /etc/apt/sources.list.d/sensu.list’’’

Errors:

- Err:1 https ://repositories.sensuapp . org/apt xenial/main amd64 sensu amd64 1.9.0-1  
Could not resolve host: [repositories.sensuapp.org](http://repositories.sensuapp.org)  
E: Failed to fetch https ://repositories.sensuapp . org/apt/pool/xenial/main/s/sensu/sensu\_1.9.0-1\_amd64.deb Could not resolve host: repositories.sensuapp . org

- E: The repository ‘http ://repositories.sensuapp . org/apt sensu Release’ does not have a Release file.

- Err:1 https ://repositories.sensuapp . org/apt xenial/main amd64 sensu amd64 1.9.0-1  
Could not resolve host: repositories.sensuapp . org  
E: Failed to fetch https ://repositories.sensuapp . org/apt/pool/xenial/main/s/sensu/sensu\_1.9.0-1\_amd64.deb Could not resolve host: repositories.sensuapp . org

**2. Tell us about your setup, this should include OS, version of Sensu, version of Sensu components (redis, rabbitmq), plugin versions (if applicable), anything special about your setup such as an airgapped network or strict ACLs**

- 1.4.2-1 500  
500 https ://repositories.sensuapp . org/apt xenial/main amd64 Packages  
100 /var/lib/dpkg/status
- /var/lib/apt/lists | grep sensu  
packagecloud . io\_sensu\_stable\_ubuntu\_dists\_xenial\_InRelease  
packagecloud . io\_sensu\_stable\_ubuntu\_dists\_xenial\_main\_binary-amd64\_Packages  
repositories.sensuapp . org\_apt\_dists\_xenial\_main\_binary-amd64\_Packages  
repositories.sensuapp . org\_apt\_dists\_xenial\_Release  
repositories.sensuapp . org\_apt\_dists\_xenial\_Release.gpg

**3. Is there a Github issue related to your issue?**

- Yes? Most likely deprecation of Core means repos no longer valid…

**4. Is there anything else that can help us effectively help you?**

- Long story short, I am fixing our Sensu server that someone installed moons ago. No one has been monitoring it for well over a year, which means no upgrades. So…I want to migrate it to Sensu-Go with the translation tool but documentation says our Sensu Core needs to be upgraded to version 1.9.0-1 first before I start the migration. Documentation from [cwjohnston](https ://discourse.sensu . io/u/cwjohnston) in November 2019 says the repos are no longer reachable.

Is there a solution I am missing or am I going to have to completely start over?

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**Author:** ![jspaleta](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.sensu.io/jspaleta/32/141_2.png) [@jspaleta](https://discourse.sensu.io/u/jspaleta)\
**Post date:** [January 26, 2021, 8:40pm UTC](https://discourse.sensu.io/t/cant-update-to-sensu-core-1-9-0-1-for-migrating-to-sensu-go/2324/2 "2021-01-26T20:40:30Z")

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Hey!

I think the best thing you can do is to setup a sensu go running in parallel and migrate workloads over.  
There’s no fully automated path from Sensu Core (ruby based) into Sensu Go (golang) because the data model changed.

The translation tool helps get you started at migrating resource definitions, but its not a full migration tool.

And because of the way things are engineered it should be possible for you to stand up a sensu-go service and agent that runs side by side with the old codebase if you need to take it slowly and migrate monitoring workloads. The new sensu-backend service should be using different default ports, so it should not conflict with the sensu-core services, making it possible to run side by side if needed as you migrate.

-jef

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**Author:** ![calebhailey](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.sensu.io/calebhailey/32/46_2.png) [@calebhailey](https://discourse.sensu.io/u/calebhailey)\
**Post date:** [January 28, 2021, 7:53am UTC](https://discourse.sensu.io/t/cant-update-to-sensu-core-1-9-0-1-for-migrating-to-sensu-go/2324/3 "2021-01-28T07:53:49Z")

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@D_Lasa 👋 it’s hard to tell because the error messages you shared aren’t formatted very well, but it looks like all the error messages were referring to the now-deprecated repositories. These were replaced last year with a temporary repository, as detailed in the first blog you linked to:

> **[Sensu | Announcing the Sensu archives](https://sensu.io/blog/announcing-the-sensu-archives)**
>
> The Sensu Core 1.x repositories will remain available for all users until April 6, 2020. Read on for more details about Sensu 1.x EOL.

I would encourage you to review that blog post as the information there is still valid (though not for long); specifically including the new repository DNS record: `eol-repositories.sensuapp.org`

The packages you need to upgrade to 1.9.0 will still available, but [only until Monday (Feb 1)](https://discourse.sensu.io/t/updated-eol-timeline-for-sensu-core-and-sensu-enterprise-repos/2396): [Index of /apt/pool/xenial/main/s/sensu/](https://eol-repositories.sensuapp.org/apt/pool/xenial/main/s/sensu/)

I hope this helps!