Linux Cbt Rhel 6 Change
Giovanna Qiu
I have a little problem. I have a brand new Red Hat Linux Server and I installed Docker CE for CentOS/Red Hat with the official repositories for Docker CE. Now I see that docker creates the container under /var/lib/docker, but my problem is that I use an extra partition for my data under /data/docker. How can I change the default root directory for Docker in CentOS/Red Hat?
The short- and long-term solutions to this change are something we will be discussing over the coming weeks. We spent much of our time today diving deep to ensure we understood the depth of the problem, and discussing our potential options.
Your hostname is a vital piece of system information that you need to keep track of as a system administrator. Hostnames are the designations by which we separate systems into easily recognizable assets. This information is especially important to make a note of when working on a remotely managed system. I have experienced multiple instances of companies changing the hostnames or IPs of storage servers and then wondering why their data replication broke. There are many ways to change your hostname in Linux; however, in this article, I'll focus on changing your name as viewed by the network (specifically in Red Hat Enterprise Linux and Fedora).
Before moving on from the hostname command, I'll show you how to use it to change your transient hostname. Using hostname (where x is the new hostname), you can change your network name quickly, but be careful. I once changed the hostname of a customer's server by accident while trying to view it. That was a small but painful error that I overlooked for several hours. You can see that process below:
It is also possible to use the hostnamectl command to change your hostname. This command, in conjunction with the right flags, can be used to alter all three types of hostnames. As stated previously, for the purposes of this article, our focus is on the transient hostname. The command and its output look something like this:
The final method to look at is the sysctl command. This command allows you to change the kernel parameter for your transient name without having to reboot the system. That method looks something like this:
I hope that you found this information useful as a quick and easy way to manipulate your machine's network-visible hostname. Remember to always be careful when changing system hostnames, especially in enterprise environments, and to document changes as they are made.
And please tell your employees to stop patronizing me, saying I should just use CentOS Stream. There's a reason Rocky and Alma linux have been downloaded millions of times. Stream is not a substitute for CentOS.
"UPDATE 2023.06.26: I can confirm via Red Hat employees the Developer Subscription has not experienced any changes. There is a display bug with the Customer Portal that is being tracked down. The DS4I is still limited to 16 entitlements."
Thanks to all, lots of good input. Our servers are to support our own businesses, and a few partners, and just use webmin/virtualmin, wp/php stuff, MySQL, python stuff, etc. I want to get this migration done now/soon and to a target that isn't going to change for awhile, and remain non-commercial OSS. Thanks again.
Well, nope. Unless RH changes their mind/policy, support for CentOS Stream X ends when final X.Y release of RHEL is released and that RHEL version goes from "Full" to "Maintenance Support" mode, which happens about 5 years after initial X.0 release. Look at centos.org, they already announced EOL for CentOS Stream 8 in May next year. That also means C9S will probably live only till mid-2027. Bummer.
"Red Hat currently says they can cancel any user's account if they download the source code and redistribute it." - lets see a link please and where it says that. Would also love to see a link to previous versions of the same document to highlight what changed therein.
Maybe it time For IBM Hat to pay Fedora users, for the alpha testin of the packages, that will land in rhel'?
Would be awesome to see achange in Linux kernel license that excludes IBM/RH from using Linux kernel. xD
Not the first time IBM are short sighted. They are the same folks who once said OS market would never be profitable (or something along those lines), making room for one of the most profitable businesses ever.
Maybe I am reading too much in this but attempting to monetize on CentOS is basically saying they are desperate for cash, even small change. Maybe they are beyond healing
I have no idea what they're thinking. I've been a red hat advocate in my company for years, introducing rhel and tower to my team and enterprise. I have to think this is IBMs doing, the same IBM that forced us to install licensing software across every system in our company.
Thank you for this. I work for a large government agency in a capacity to make decisions about the OS's we use to deploy. (On-prem cloud, container orchestration, change/config management, etc) We have large Ansible and OpenShift services that I'm going to migrate away from. RedHat will be the last solution on my list for new projects now. I'll frame it as a way to save massive amounts of money on subscription costs. Noone will scoff at that. RIP RedHat.
I spent a lot of time picking apart the change from CentOS to CentOS Stream, and decided I was OK with it. I understood the reasoning behind it, and it made sense to me. Rocky and Alma also make sense to me, and I fully support those projects.
After it was up and running I discovered the /var/lib/jenkins partition on my server is very small. I want to move it, but I do not want to change the user that it runs under. I am new to Linux and I'm stumped. How do I move it for example to my Home/Public folder? The "Jenkins" user doesn't seem to have a Home folder. Its running as a daemon on startup, so I have no idea where to configure those settings.Can I create a Home folder for the Jenkins user? How?
1) How to configure the system locale and user locale for a local login.
2) How to configure the user locale for a ssh login.
3) How to confirm that the changes in the previous steps were successful.
Configuring locales that are set at login requires some knowledge of different configuration files. What changes you will need to make depend upon your business requirements and what you want to achieve as the end result. Red Hat recommends that you should be able to first clearly define what the end result you want to achieve is. After writing that down you should not make any configuration changes until after you have read and understood this solution article.
If LANG is set, a copy of the variable is saved and the user's .i18n file in its home directory is sourced. However, note that LANG is set back to the saved value. That is, if LANG is already set, you cannot change the value of LANG from a .i18n file in your home directory. You can however set LC_ALL instead, since the value of LC_ALL takes precedence over the LANG environment variable (see ). Other LC_* environment variables also take precedence over LANG, but LC_ALL takes precedence over all other LC_* environment variables.
The above output is from sshd_config. If LANG is one of the environment variables passed, it will not be changed during the login process. See "How to configure a system wide or a user specific locale for local access." for an explanation of why.
For example, when logging directly into a RHEL 7 server, e.g. at the console, if the value of LANG is set as follows (this is an example value, your system may be different):
Confirm that LANG is present in the AcceptEnv of the servers sshd_config file.
NOTE: If you modify anything in sshd_config, the sshd service must be restarted to enable the change.
If the locale isn't what you now expect it to be, you should verify that the steps above have been followed. This discussion assumes that no changes have been made to files such as a user's .bash_profile, .bash_login, .profile.bashrc, etc to change locale environment variables.
There is no need to reboot the server. "Logging out and backing in" will allow you to see the locale change. This is a bit of a mistake in some cases. If you are running an application (background process) which requires LANG=C and you change the /etc/locale.conf, then "log out and log back in" -- the app will still be running LANG=C when you log back in, as you can confirm via cat /proc/pid/environ
For example, we have an app that required LANG=C but our Puppet agent required LANG=en_US.UTF-8.After changing the system-wide locale, the application continued to run with LANG=C while puppet with the other. Once the server was rebooted (days later), the app started up with LANG=en_US.UTF-8 and that caused issues for the application. The workaround for us in this case was to revert the changes and reboot again, then write a wrapper script for 'puppet agent -t' commands on the command line, and add LANG=en_US.UTF-8 to /etc/sysconfig/puppet.
For Centos 7 running MATE GUI, it's in the menu under System -> Preferences -> Look and Feel -> Screensaver. You can turn it off from here, as well as locking the screen when computer is idle.Also, there is Power Management button in the bottom toolbar of Screensaver preferences windows where you can change additional settings like dimming the screen, turning it off after certain time, etc.
Before rebooting the system for relabeling, make sure the system will boot in permissive mode, for example by using the enforcing=0 kernel option. This prevents the system from failing to boot in case the system contains unlabeled files required by systemd before launching the selinux-autorelabel service. For more information, see RHBZ#2021835.
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