订阅内容
Linux 

As I was reading through the Red Hat Enterprise Linux 8 Beta release notes, one thing that caught my eye was that a session recording solution had been added to RHEL 8 Beta, which allows for users’ terminal sessions to be recorded and played back at a later time.  

Before coming to Red Hat to work as a technical account manager (TAM), I worked as a system administrator for 12 years.   I can’t count the number of times that an issue would occur from human error, and management would come to me, asking me to figure out who had caused the issue.   At that point, I would start looking through log files and shell history files. Based on that information, sometimes I would be able to figure out what and who had caused the issue, and other times it wasn’t possible.  This was usually a labor intensive process which took a lot of time trying to piece together what users had previously been doing on a server.

It would have been great to have a tool like RHEL 8 session recording that recorded everything users did on the command line.   Not only would that have made this detective process easier, but it might have prevented some oversights from happening in the first place if users were aware that what they were doing was being recorded.  After all, people are usually on their best behavior when they know they are being recorded.

Based on these experiences, I was very intrigued with RHEL 8 Session recording. In this post, we will cover how to get started with RHEL 8 Session Recording.  

Initial Installation and Configuration

The first step to getting started with session recording is to install the tlog package, which provides the session recording functionality, and the cockpit-session-recording package which allows for easy management and playback of sessions from the web console management tool.  

yum install tlog cockpit-session-recording

If the cockpit service isn’t already running and enabled to start at boot, this can be done with systemctl:

systemctl enable --now cockpit.socket

The recommended way to use session recording in RHEL 8 Beta is in conjunction with SSSD, which many RHEL environments use to manage user authentication.  In this example, I will setup a very basic SSSD configuration to manage local RHEL users.

To do this, I created an /etc/sssd/sssd.conf file with this basic example configuration:

[domain/local]
id_provider = files

[sssd]
domains = local
services = nss, pam, ssh, sudo

I then set the sssd.conf file permissions, and restart sssd:

chmod 600 /etc/sssd/sssd.conf
systemctl restart sssd

The next step is to open a web browser and to browse to the cockpit web interface, which is available on port 9090.  I used firefox, and browsed to https://<IP-Address>:9090, where <IP-Address> is the IP address of the RHEL 8 server.  

Login to cockpit either as the root user, or you can login with another user with sudo privileges, and check the box on the login screen to “Reuse my password for privileged tasks”.  

Once logged in, click on the “Session Recording” link on the left hand menu, then click the configuration gear button in the upper right corner.  

 

Web console in RHEL 8 Beta


From here, several options can be configured such as a warning message to display to users to let them know their session is being recorded.   I’ll stick to the defaults, and scroll down to the SSSD Configuration section. From here, I’ll set the “Scope” to “All”, and click the Save button.  This will configure session recording for all SSSD users.

 

SSSD Configuration

Testing Out Session Recording

At this point, we have a basic session recording configuration setup, and we will confirm that it’s working. I’ll login to the server over SSH:

 

SSH Session

Notice the warning message that this session is being recorded (this message is configurable).  

Next, I’ll go ahead and run several commands which will be recorded, then exit out of the SSH session.  

Back from the web console interface, if I go back to the “Session Recording” menu option, I can see the sessions that have been recorded, including: the user name, the start and end times, and the duration of the recording:

 

Web console session chooser

I’ll click on the this line, which will take me to the session recording player screen, where I can click the play button and watch what happened during the session. I can also change the playback speed to speed up or slow down the playback.  In my recorded session, I had run the top command:

 

Web console session playback

Accessing Recordings from the Command Line

It is also possible to access the recordings from the command line rather than the Cockpit web based interface.   By default, the session recordings are stored in journalctl.

The first step to playing back a session from the command line is to find the recording ID, by running a command such as journalctl -o verbose | grep \"rec\".

Once the recording ID has been determined, the session can be played back with the tlog-play -r journal -M TLOG_REC= command, where recording_ID is the recording ID found with the previous journalctl command.

As an example, see the screenshot of session playback:

 

Terminal-based session playback

Summary and Closing

We’ve covered how to get started with RHEL 8 session recording in this post.  I’ve also created a video covering this information, which is available on the Red Hat Videos YouTube channel.


关于作者

Brian Smith is a Product Manager at Red Hat focused on RHEL automation and management.  He has been at Red Hat since 2018, previously working with Public Sector customers as a Technical Account Manager (TAM).  

Read full bio

按频道浏览

automation icon

自动化

有关技术、团队和环境 IT 自动化的最新信息

AI icon

人工智能

平台更新使客户可以在任何地方运行人工智能工作负载

open hybrid cloud icon

开放混合云

了解我们如何利用混合云构建更灵活的未来

security icon

安全防护

有关我们如何跨环境和技术减少风险的最新信息

edge icon

边缘计算

简化边缘运维的平台更新

Infrastructure icon

基础架构

全球领先企业 Linux 平台的最新动态

application development icon

应用领域

我们针对最严峻的应用挑战的解决方案

Original series icon

原创节目

关于企业技术领域的创客和领导者们有趣的故事