Running PMM1 and PMM2 Clients on the Same Host

Want to try out Percona Monitoring and Management 2 (PMM 2) but you’re not ready to turn off your PMM 1 environment?  This blog is for you! Keep in mind that the methods described are not intended to be a long-term migration strategy, but rather, simply a way to deploy a few clients in order to sample PMM 2 before you commit to the upgrade.

Here are step-by-step instructions for deploying PMM 1 & 2 client functionality i.e. pmm-client and pmm2-client, on the same host.

1. Deploy PMM 1 on Server1 (you’ve probably already done this)
2. Install and setup pmm-client for connectivity to Server1
3. Deploy PMM 2 on Server2
4. Install and setup pmm2-client for connectivity to Server2
5. Remove pmm-client and switched completely to pmm2-client

The first few steps are already described in our PMM1 documentation so we are simply providing links to those documents.  Here we’ll focus on steps 4 and 5.

Install and Setup pmm2-client Connectivity to Server2

It’s not possible to install both clients from a repository at the same time. So you’ll need to download a tarball of pmm2-client. Here’s a link to the latest version directly fromour site.

Download pmm2-client Tarball

* Note that depending on when you’re seeing this, the commands below may not be for the latest version, so the commands may need to be updated for the version you downloaded.

$ wget https://www.percona.com/downloads/pmm2/2.1.0/binary/tarball/pmm2-client-2.1.0.tar.gz

Extract Files From pmm2-client Tarball

$ tar -zxvf pmm2-client-2.1.0.tar.gz 
$ cd pmm2-client-2.1.0

Register and Generate Configuration File

Now it’s time to set up a PMM 2 client. In our example, the PMM2 server IP is 172.17.0.2 and the monitored host IP is 172.17.0.1.

$ ./bin/pmm-agent setup --config-file=config/pmm-agent.yaml \
--paths-node_exporter="$PWD/pmm2-client-2.1.0/bin/node_exporter" \
--paths-mysqld_exporter="$PWD/pmm2-client-2.1.0/bin/mysqld_exporter" \
--paths-mongodb_exporter="$PWD/pmm2-client-2.1.0/bin/mongodb_exporter" \
--paths-postgres_exporter="$PWD/pmm2-client-2.1.0/bin/postgres_exporter" \
--paths-proxysql_exporter="$PWD/pmm2-client-2.1.0/bin/proxysql_exporter" \
--server-insecure-tls --server-address=172.17.0.2:443 \
--server-username=admin  --server-password="admin" 172.17.0.1 generic node8.ca

Start pmm-agent

Let’s run the pmm-agent using a screen.  There’s no service manager integration when deploying alongside pmm-client, so if your server restarts, pmm-agent won’t automatically resume.

# screen -S pmm-agent

$ ./bin/pmm-agent --config-file="$PWD/config/pmm-agent.yaml"

Check the Current State of the Agent

$ ./bin/pmm-admin list
Service type  Service name         Address and port  Service ID
 
Agent type                  Status     Agent ID                                        Service ID
pmm-agent                   connected  /agent_id/805db700-3607-40a9-a1fa-be61c76fe755  
node_exporter               running    /agent_id/805eb8f6-3514-4c9b-a05e-c5705755a4be

Add MySQL Service

Detach the screen, then add the mysql service:

$ ./bin/pmm-admin add mysql --use-perfschema --username=root mysqltest
MySQL Service added.
Service ID  : /service_id/28c4a4cd-7f4a-4abd-a999-86528e38992b
Service name: mysqltest

Here is the state of pmm-agent:

$ ./bin/pmm-admin list
Service type  Service name         Address and port  Service ID
MySQL         mysqltest            127.0.0.1:3306    /service_id/28c4a4cd-7f4a-4abd-a999-86528e38992b
 
Agent type                  Status     Agent ID                                        Service ID
pmm-agent                   connected  /agent_id/805db700-3607-40a9-a1fa-be61c76fe755   
node_exporter               running    /agent_id/805eb8f6-3514-4c9b-a05e-c5705755a4be   
mysqld_exporter             running    /agent_id/efb01d86-58a3-401e-ae65-fa8417f9feb2  /service_id/28c4a4cd-7f4a-4abd-a999-86528e38992b
qan-mysql-perfschema-agent  running    /agent_id/26836ca9-0fc7-4991-af23-730e6d282d8d  /service_id/28c4a4cd-7f4a-4abd-a999-86528e38992b

Confirm you can see activity in each of the two PMM Servers:

PMM 1 PMM 2

Remove pmm-client and Switch Completely to pmm2-client

Once you’ve decided to move over completely to PMM2, it’s better to make a switch from the tarball version to installation fromthe repository. It will allow you to perform client updates much easier as well as register the new agent as a service for automatically starting with the server. Also, we will show you how to make a switch without re-adding monitored instances.

Configure Percona Repositories

$ sudo yum install https://repo.percona.com/yum/percona-release-latest.noarch.rpm 
$ sudo percona-release disable all 
$ sudo percona-release enable original release 
$ yum list | grep pmm 
pmm-client.x86_64                    1.17.2-1.el6                  percona-release-x86_64
pmm2-client.x86_64                   2.1.0-1.el6                   percona-release-x86_64

Here is a link to the apt variant .

Remove pmm-client

yum remove pmm-client

Install pmm2-client

$ yum install pmm2-client
Loaded plugins: priorities, update-motd, upgrade-helper
4 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package pmm2-client.x86_64 0:2.1.0-5.el6 will be installed
...
Installed:
  pmm2-client.x86_64 0:2.1.0-5.el6                                                                                                                                                           
 
Complete!

Configure pmm2-client

Let’s copy the currently used pmm2-client configuration file in order to omit re-adding monitored instances.

$ cp pmm2-client-2.1.0/config/pmm-agent.yaml /tmp

It’s required to set the new location of exporters ( /usr/local/percona/pmm2/exporters/ ) in the file.

$ sed -i 's|node_exporter:.*|node_exporter: /usr/local/percona/pmm2/exporters/node_exporter|g' /tmp/pmm-agent.yaml
$ sed -i 's|mysqld_exporter:.*|mysqld_exporter: /usr/local/percona/pmm2/exporters/mysqld_exporter|g' /tmp/pmm-agent.yaml
$ sed -i 's|mongodb_exporter:.*|mongodb_exporter: /usr/local/percona/pmm2/exporters/mongodb_exporter|g' /tmp/pmm-agent.yaml 
$ sed -i 's|postgres_exporter:.*|postgres_exporter: /usr/local/percona/pmm2/exporters/postgres_exporter|g' /tmp/pmm-agent.yaml
$ sed -i 's|proxysql_exporter:.*|proxysql_exporter: /usr/local/percona/pmm2/exporters/proxysql_exporter|g' /tmp/pmm-agent.yaml

The default configuration file has to be replaced by our file and the service pmm-agent has to be restarted.

$ cp /tmp/pmm-agent.yaml /usr/local/percona/pmm2/config/
$ systemctl restart pmm-agent

Check Monitored Services

So now we can verify the current state of monitored instances.

$ pmm-admin list

Also, it can be checked on PMM server-side.