Upgrade from once version to another

Change the build id in follwoing location

a. cluster/<cluster_name>/infra/init.yml
```
 openstack_version: ocata
 apt_mk_version: 2018.4.0
```
b. cluster/<cluster_name>/cicd/control/init.yml
```
 openstack_version: ocata
 apt_mk_version: 2018.4.0
```
Update mk-pipelines and pipeline-library using jenkins
Verify that the following class is present in the

cluster/cicd/control/leader.yml file of your Reclass model:
```
 classes:
   - system.jenkins.client.job.deploy.update
```
Mkae sure take backup of any custom changes to classes/system
```
 git diff > 2018.4.0.patch
```
Update the classes/system to updating tag at classes/system
```
 git checkout 2018.4.0
```
apply the patch to classes/system
```
 git apply 2018.4.0.patch
```

Update Jenkins pipelines:

 salt -C 'I@jenkins:client' state.sls jenkins.client

Upgrade MCP Drive Train

Enable the update pipelines in the model by adding the following class to the leader.yml file in the classes/cluster/${_param:cluster_name}/cicd/control/ directory:
- system.jenkins.client.job.deploy.update.utils
Apply the change:

salt -C 'I@jenkins:client' state.apply jenkins.client
Log in as Administrator or refresh your Jenkins web UI.

MCP DriveTrain component Pipeline

System Reclass model Deploy - Update reclass metadata Salt formulas Deploy - Update salt master formulas Jenkins pipelines Deploy - Update jenkins master jobs

This pipeline helps with

Delivering hot fixes to source code of OpenStack, Kubernetes, or MCP Control Plane. Updating packages for an OpenStack service. Applying security patches to operating system components and packages.
Change service configuration by running below Job

Update Service(s) Configuration
Update service packages by running below Jobs

Update System Package(s)
Add a service to MCp cluster

Update Service(s) Configuration

Major upgrades enable:

Delivering new features of MCP Control plane. Upgrading between OpenStack releases. Upgrading host and guest operating systems to new versions including kernels. Upgrading the OpenStack compute nodes. Updating the LCM platform. Upgrading the OpenStack OVS gateway nodes. Upgrading the OpenContrail nodes to 3.2 version. Upgrading the OpenContrail nodes to 4.x version.