How to install Cockpit on CentOS 7

Learn how to install Cockpit on CentOS 7 with our step-by-step guide. Simplify your server management by setting up Cockpit on your CentOS 7 server efficiently. #centlinux #linux #cockpit

What is Cockpit?

Cockpit is a Red Hat sponsored free and open-source software project. Cockpit is a Web UI (User Interface) that facilitates management and monitoring of a Linux server through a web browser. Besides regular operating system related management tasks, it also provides support for Docker, Kubernetes and KVM.  It is very easy to start containers, administer storage, configure networks, and inspect logs via Cockpit Web UI.

Cockpit is an open-source web-based server management tool designed to simplify the administration of Linux systems. It provides a user-friendly interface for managing various aspects of your server. Here are some key features and aspects of Cockpit:

Key Features of Cockpit

1. Web-Based Interface:
   • Provides an intuitive, browser-based interface for managing your Linux server.
2. System Monitoring:
   • Displays real-time system metrics such as CPU, memory, disk usage, and network activity.
3. Service Management:
   • Allows you to start, stop, enable, or disable system services.
4. Log Viewing:
   • Offers access to system logs to help you troubleshoot issues.
5. User Management:
   • Enables you to manage user accounts, including creating, deleting, and modifying user permissions.
6. Software Updates:
   • Facilitates the installation of system updates and software packages.
7. Storage Management:
   • Provides tools for managing storage devices, partitions, and filesystems.
8. Network Configuration:
   • Allows you to configure network interfaces, view network statistics, and manage firewall rules.
9. Container Management:
   • Supports Docker and Podman for managing containers and container images.
10. Remote Access:
    • Supports remote management of servers, making it easier to administer systems from different locations.
11. Extensibility:
    • Offers a plugin architecture that allows you to extend its functionality with additional features.

Common Use Cases

• System Administrators: For managing and monitoring servers in both small and large environments.
• Developers: For managing development environments and deployments.
• IT Professionals: For overseeing multiple servers and performing routine maintenance tasks.

Cockpit is designed to be simple to use while providing powerful management tools, making it a great option for both beginners and experienced administrators.

Recommended Online Training: Learn Bash Shell in Linux for Beginners

Linux Server Specification

In this article, we will install Cockpit on CentOS 7 server and then add support in Cockpit for managing our Kubernetes cluster, Docker and Storage.

We have a CentOS 7 virtual machine with following specifications.

• Hostname – kubemaster-01.example.com
• IP Address – 192.168.116.160/24
• Operating System – CentOS 7.6

The above server is the master node of a Kubernetes cluster. For information about Kubernetes configuration please refer to our previous article Install Kubernetes Cluster on CentOS 7. To read more about Kubernetes you should read Kubernetes in Action (PAID LINK) by Marko Luksa.

Install Cockpit on CentOS 7

Connect with kubemaster-01.example.com using ssh as root user.

Cockpit is available through EPEL (Extra Packages for Enterprise Linux) yum repository. Therefore, we have to install epel-release first.

# yum install -y epel-release

Rebuild cache of yum repositories.

# yum clean all
Loaded plugins: fastestmirror
Cleaning repos: base docker-ce-stable epel extras kubernetes updates
Cleaning up list of fastest mirrors

# yum makecache fast
Loaded plugins: fastestmirror
Determining fastest mirrors
epel/x86_64/metalink | 7.9 kB 00:00
* base: ftp3.isra.edu.pk
* epel: mirrors.nipa.cloud
* extras: ftp3.isra.edu.pk
* updates: ftp3.isra.edu.pk
base | 3.6 kB 00:00
docker-ce-stable | 3.5 kB 00:00
epel | 4.7 kB 00:00
extras | 3.4 kB 00:00
kubernetes/signature | 454 B 00:00
kubernetes/signature | 1.4 kB 00:00 !!!
updates | 3.4 kB 00:00
(1/10): base/7/x86_64/group_gz | 166 kB 00:00
(2/10): epel/x86_64/group_gz | 88 kB 00:00
(3/10): docker-ce-stable/x86_64/updateinfo | 55 B 00:01
(4/10): docker-ce-stable/x86_64/primary_db | 28 kB 00:01
(5/10): extras/7/x86_64/primary_db | 201 kB 00:01
(6/10): kubernetes/primary | 49 kB 00:01
(7/10): epel/x86_64/updateinfo | 1.0 MB 00:05
(8/10): updates/7/x86_64/primary_db | 5.0 MB 00:13
(9/10): epel/x86_64/primary_db | 6.7 MB 00:25
(10/10): base/7/x86_64/primary_db | 6.0 MB 00:28
kubernetes 351/351
Metadata Cache Created

Install cockpit using yum command.

# yum install -y cockpit

Enable and start Cockpit service.

# systemctl enable cockpit.socket
Created symlink from /etc/systemd/system/sockets.target.wants/cockpit.socket to /usr/lib/systemd/system/cockpit.socket.
# systemctl start cockpit.socket

Configure Linux Firewall

Allow Cockpit Service in Linux firewall.

# firewall-cmd --permanent --add-service=cockpit
success
# firewall-cmd --reload
success

Access Cockpit Web UI

Browse URL https://kubemaster-01.example.com:9090/ in a client’s browser. You may encounter a security certificate warning; just ignore it and continue.

Login as root user.

We are now at the system panel of Cockpit. We can monitor system performance here and modify a couple of settings like hostname, system time, etc.

We also have some other panels here like Logs, Networking, Accounts, Services, etc. However, we are installing Cockpit to control our Kubernetes cluster from here. Therefore, we have to add required functionality in Cockpit Web UI.

Install Cockpit Control Panels

Install following packages to add the Kubernetes and Docker control panels in Cockpit Web UI.

# yum install -y cockpit-docker cockpit-kubernetes

Restart Cockpit service.

# systemctl restart cockpit.socket

Cockpit Web UI will be disconnected due to restart of cockpit.service.

Click on Reconnect.

Login as root user.

Now you see some new controls on the right side of the console.

Click on Containers, it provides Docker related control panel.

Click on Cluster to manager Kubernetes cluster.

We can add more control panels in the same way.

You may have notice that the Cockpit lacks a storage control panel. It is because Cockpit do not install Storage panel by default.

Therefore, to add Storage related control panel in Cockpit Web UI, we have to install cockpit-storaged package using yum command.

# yum install -y cockpit-storaged

Restart Cockpit service.

# systemctl restart cockpit.socket

Reconnect again to Cockpit Web UI and you may find the Storage Panel there.

If you are installing on a KVM host then you must install cockpit-machines package to add a control panel to manage Virtual machines.

If you are new to Linux and facing difficulty in working at Linux Bash prompt. We recommend that, you should read The Linux Command Line, 2nd Edition: A Complete Introduction by William Shotts.

Final Thoughts

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