Sunday, 31 March 2019

Configure Portainer Web UI for Docker on CentOS 7

Configure Portainer Web UI for Docker on CentOS 7

Portainer is a web-based user interface for management of Docker environments. Portainer is free and open-source management toolset that allows us to easily build, manage and maintain Docker environments. Portainer gives us a detailed overview of our Docker environments and allows us to manage our containers, images, networks, volumes, registries, services, nodes and stacks from a single web interface.

Requirement of a Web UI arises because Docker Engine CE provides a single CLI utility (i.e. docker) to create and manage all components of the Docker environments. It is good for hardcore CLI DevOps engineers, but it is quiet difficult for GUI addicts. Therefore, we have to look for some third party Web UI like Portainer to help the non-CLI users in performing the same Docker tasks from an Web UI.

In this article, we are configuring a Docker Web UI, i.e. Portainer on CentOS 7 based Docker Swarm. To achieve this we use the Docker technology, as we download Portainer image from Docker Hub and run it to manage our Docker Swarm cluster.

There is a good book on Docker Technology i.e.

We highly recommend you to read it for in-depth understanding of Docker Technology.

 

System Specification:

We have a Docker Swarm cluster on CentOS 7 consist of two nodes (1 Manager & 1 Worker) with following specifications:

Hostname: docker-manager-01 docker-worker-01
IP Address: 192.168.116.150/24 192.168.116.151/24
Operating System: CentOS 7.6 CentOS 7.6
Docker Version: Docker CE 18.09 Docker CE 18.09
Node Role: Manager Worker

To setup the required environment, you can refer to our previous article Configure Docker Swarm Cluster on CentOS 7.

 

Configuring Portainer Web UI for Docker on CentOS 7:

Connect to Docker Swarm's Manager node docker-manager-01 using ssh as root user.

List the nodes in our Docker Swarm cluster.

[root@docker-manager-01 ~]# docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION 3b9wynaya1wu910nf01m5jeeq * docker-manager-01.example.com Ready Active Leader 18.09.3 ydgqdyoksx2mb0snhe1hwvco7 docker-worker-01.example.com Ready Active

Pull the latest Portainer image from Portainer repository at Docker Hub.

[root@docker-manager-01 ~]# docker pull portainer/portainer:latest latest: Pulling from portainer/portainer d1e017099d17: Pull complete 0b1e707a06d2: Pull complete Digest: sha256:d6cc2c20c0af38d8d557ab994c419c799a10fe825e4aa57fea2e2e507a13747d Status: Downloaded newer image for portainer/portainer:latest

Create a Docker volume for Portainer container data.

[root@docker-manager-01 ~]# docker volume create portainer_data portainer_data

Create and run a Docker container from Portainer image.

[root@docker-manager-01 ~]# docker run -d \ > --name portainer-01 \ > --restart unless-stopped \ > -p 9000:9000 \ > -v /var/run/docker.sock:/var/run/docker.sock \ > -v portainer_data:/data \ > portainer/portainer 41feb52e01f51a6a2c65841c24d00c2ca9b456441dd78367bb9d8dda33c5d9c4

We mounted the Docker volume portainer_data in portainer1 container and published the service port 9000.

By publishing the service port 9000, we have mapped it with the service port 9000 of Docker host. Therefore, we have to allow this service port in Docker host's firewall.

[root@docker-manager-01 ~]# firewall-cmd --permanent --add-port=9000/tcp success [root@docker-manager-01 ~]# firewall-cmd --reload success

Browse URL https://docker-manager-01.example.com:9000/ and create Portainer’s initial admin account.

Note: If you do not create a Portainer admin account within 5 minutes after starting the portainer1 container. The container will be stopped automatically and then you have to start it again.

portainer-web-ui-create-initial-administrator

Enter a password and then click on Create User.

portainer-web-ui-connection-remote

We are now at the connect with Docker environment page. Click on Local.

portainer-web-ui-connection-local

Click on Connect.

portainer-web-ui-endpoints-home

Click on the Local endpoint.

portainer-web-ui-endpoint-summary

Click on the Swarm from left side panel.

portainer-web-ui-swarm

Click on Containers from left side panel.

portainer-web-ui-containers-list

We can manage our complete Docker platform from Portainer Web UI including images, container, services, volumes, registries, clusters, stacks, etc.

We have successfully configured Portainer Web UI for Docker on CentOS 7. Stay connected, we will soon explore other Web UI for Docker.

Configure Portainer Web UI for Docker on CentOS 7


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