If you would like help evaluating whether you should move to CentOS 7 or 8, please let us know!Īside from having to make the decision about which version of CentOS to upgrade to, the move from 6 to another CentOS is the same as the move from CentOS 7 to CentOS 8. If you move to CentOS 7, that means you will have to go through this process again much sooner. Still, we cannot recommend moving to CentOS 7 or CentOS 8. It is also more likely that there will be breaking changes in your application with a jump from CentOS 6 to CentOS 8. This is as true of moving from 7 to 8 as it is from 6 to 8, but it is more likely that someone else has already vetted moving to CentOS 8 if you are being asked to upgrade CentOS 7. For example, Katello will not support CentOS until March 2021. Moving from CentOS 6 to 7 or 8Īt first glance, the logical thing to do might be to move from CentOS 6 directly to 8, but not everything works in CentOS 8 yet. Then, you need to change the DNS to the new server or give your colleagues the new IP address. Once the machine is provisioned, you need to move over any applications and data. Many of the configuration management tools also have some way to be used as a provisioner. This could also mean using ovirt or Terraform. In AWS, this would mean launching a new EC2 instance (assuming you aren’t using EKS). What you need to do in this case is provision a new OS install. This upgrade path is not supported by the CentOS developers. Technically, you can find instructions on the Internet for doing this type of upgrade with yum and dnf, but you really should not use those instructions. This is particularly true if you are using third-party repos, but one of the key reasons to use an OS like CentOS is the attempt not to break application APIs in a major version. Although unlikely, this might also be true with a simple ‘yum update’. When you are talking about moving OS levels, another important item is making sure your applications have all of the needed dependencies on the new OS. They are still out of the scope of this article, and we can still help you with that upgrade! Remember those two things I mentioned in section one that were out of the scope of this article? (It’s ok, they were configuration management and containers.) Well, you can use those to move from CentOS 7 to CentOS 8. This scenario likely means you are updating the container tag in YAML. If this is your situation, you can do some container storage magic if you need to, and pull down those new containers. There are also official CentOS containers on Docker Hub. You might have some AI that manages containers for you and keep a record of those containers in a blockchain. These are tools such as Puppet, Chef, Ansible, and Salt. When you're upgrading CentOS, you may also want to consider configuration management. You might need to run su to become the root user, or you may need to run the commands above with sudo in front of them to elevate your privileges. To upgrade your packages on CentOS 8 you run: Without further ado, to upgrade your packages on CentOS 7 you run: You can learn more about yum’s replacement, but you almost certainly do not need to know anything about dnf to upgrade your CentOS 8 other than the command below.
CentOS 8 changes that, at least by default. Yum has been the package manager for CentOS since April 2007. The good news is that in most cases you will not need to read a book to actually upgrade CentOS. We certainly can! The problem is that once you consider hardware limitations, networking, security, and application dependencies, we could literally write a book on upgrading CentOS. The high-level overview here is not meant to suggest that OpenLogic cannot guide you through the entire CentOS upgrade process. We will go through all three of these situations at a high level. If this is your situation, I suggest you move quickly, as CentOS 6 community support ends November 30, 2020.
UPGRADE OPENJDK 7 TO 8 CENTOS HOW TO
Ready to upgrade CentOS? In this blog, we look at three ways to upgrade CentOS, including how to upgrade packages, or move from CentOS 6 or CentOS 7 to CentOS 8.