Stopping and starting virtual machines in TAS for VMs

You can stop and start the component TAS for VMs virtual machines that make up your deployment. This article walks you through the steps.

This article assumes you are using BOSH CLI version 2.

In some cases, you may want to stop all your VMs (for example, power down your deployment) or start all of your VMware Tanzu Application Service for VMs (TAS for VMs) VMs (for example, recover from a power outage). You can stop or start all TAS for VMs VMs with a single bosh command.

If you want to shut down or start up a single VM in your deployment, you can use the manual process described in Stopping and Starting Individual TAS for VMs VMs.

This procedure uses the BOSH Command Line Interface (BOSH CLI). For more information about using this tool, see Advanced Troubleshooting with the BOSH CLI.

Stopping and Starting All TAS for VMs VMs

This section describes how to stop and start all the VMs in your deployment.

Stopping All TAS for VMs VMs

To shut down all the VMs in your deployment:

Scale down the following jobs to one instance:
- consul_server
- mysql
Run the following command for each of the deployments listed in the previous step:
```
bosh -e MY-ENV -d MY-DEPLOYMENT stop --hard
```
Where:
- MY-ENV is the alias you set for the BOSH Director.
- MY-DEPLOYMENT is the name of your deployment.
For example:
```
$ bosh -e prod -d mysql stop --hard
```
This command stops all VMs in the specified deployment. The `--hard` flag instructs BOSH to delete the VMs but retain any persistent disks.

Starting All TAS for VMs VMs

To start all the VMs in your deployment:

Select the product deployment for the VMs you want to shut down. You can run the following command to locate CF deployment manifests:
```
$ find /var/tempest/workspaces/default/deployments -name cf-*.yml
```
Run the following command:
```
bosh -e MY-ENV -d MY-DEPLOYMENT start
```
Where:
- MY-ENV is the alias you set for the BOSH Director.
- MY-DEPLOYMENT is the name of your deployment.
For example:
```
$ bosh -e prod -d mysql start
```
This command starts all VMs in the specified deployment.
If you require high availability in your deployment, scale up all instance groups to the original or desired counts.

Stopping and Starting Individual TAS for VMs VMs

This section describes how to stop and start individual VMs in your deployment.

Find the Names of Your TAS for VMs VMs

You need the full names of the VMs to stop and start them using the BOSH CLI. To find full names for the VMs running each component, run bosh -e MY-ENV instances, replacing MY-ENV with the alias you set for your BOSH Director. To filter the list of instances by deployment, run bosh -e MY-ENV -d MY-DEPLOYMENT instances.

For example:

$ bosh -e prod -d mysql instances
...
Deployment 'mysql'

Instance                    Process State  AZ  IPs
mysql/0123-abcd-4567ef89    running        -   10.244.0.6
mysql/abcd-0123-ef4567ab    running        -   10.244.0.2

2 instances
...

You can see the full name of each VM in the Instance column of the terminal output. Each full name includes:

A prefix indicating the component function of the VM.
An identifier string specific to the VM.

For any component, you can look for its prefix in the bosh instances output to find the full name of the VM or VMs that run it.

Stopping an Individual TAS for VMs VM

To stop a job, run the following command for the component in your TAS for VMs deployment, replacing MY-ENV with the alias you set for your BOSH Director and MY-DEPLOYMENT with the name of the deployment:

bosh -e MY-ENV -d MY-DEPLOYMENT stop VM-NAME

To delete the instance that contains the job, run the following command for the component in your TAS for VMs deployment:

bosh -e MY-ENV -d MY-DEPLOYMENT stop VM-NAME --hard

Use the full name of the component VM as listed in your bosh instances terminal output without the unique identifier string.

For example, the following command stops the Loggregator Traffic Controller job:

$ bosh -e prod -d loggregator stop loggregator_trafficcontroller

To stop a specific instance of a job, include the identifier string at the end of its full name.

For example, the following command stops the Loggregator Traffic Controller job on only one Diego Cell instance:

$ bosh -e prod -d loggregator stop loggregator_trafficcontroller/0123-abcd-4567ef89

To delete the VM, include --hard at the end of the command. This command does not delete persistent disks.

For example, the following command deletes a specific Loggregator Traffic Controller instance:

$ bosh -e prod -d loggregator stop loggregator_trafficcontroller/0123-abcd-4567ef89 --hard

Starting an Individual TAS for VMs VM

Run the following command for the component in your TAS for VMs deployment you wish to start, replacing MY-ENV with the alias you set for your BOSH Director and MY-DEPLOYMENT with the name of the deployment. Use the full name of the component VM as listed in your bosh vms terminal output without the unique identifier string.

bosh -e MY-ENV -d MY-DEPLOYMENT start VM-NAME

The following example command starts the Loggregator Traffic Controller VM:

$ bosh -e prod -d loggregator start loggregator_trafficcontroller

To start a specific instance of a VM, include the identifier string at the end of its full name.

For example, the following command starts the Loggregator Traffic Controller job on one Diego Cell instance:

$ bosh -e prod -d loggregator start loggregator_trafficcontroller/0123-abcd-4567ef89