# Update with RPM

To update Web component, you use the following commands:

> yum install dnlv6\_webbackend (for the api )
>
> yum install dnlv6\_webui (for the web ui)

To update Switch backend component, you use the following commands: 

> yum install dnlv6\_softswitch

If some cases, you may not be able to start up dnl\_api\_core, then you will need to run the following commands to reinstall the API server.

```
rm -rf /usr/lib/python3.6/site-packages/api_dnl*
yum remove  dnlv6-webbackend
yum install  dnlv6-webbackend


```

After RPM packages are installed then run the following command:

> cd /opt/denovo\_v6/api\_dnl 
>
> alembic -c alembic.ini upgrade head

{% hint style="info" %}
It is recommended that you backup your Class4 DB before you update your installation.  here is the Postgres command you can use to backup the entire database:

pg\_dump -U postgres class4\_dnl > class4\_dnl\_dump.sql
{% endhint %}


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