As of September 24, 2015, ius.io has replaced this website. This site will stay up for about 30 days for archive purposes then redirect to the new site. The old site code be still be available at the sphinx_iuscommunity Github repo.
The FAQs on this page are the most common, official questions we wanted to answer. However, if you don’t find your question here, please check out our answers section. There you can view all questions that have been answered, as well as ask your own.
- Is IUS Right For Me?
- Development and Packaging Questions
What is the IUS Community Project?¶
The IUS Community Project is an effort to package rpms of the latest stable versions of the most commonly requested software on Red Hat Enterprise Linux and CentOS. IUS provides a better way to upgrade PHP/MySQL/Python/Etc on RHEL or CentOS. The project is run by professional Linux Engineers that are primarily focused on RPM Development in the web hosting industry.
What is it NOT?¶
For one, IUS is not a service of Rackspace but rather is Sponsored by Rackspace. Additionally, IUS is not the same as Fedora EPEL or similar repos. EPEL is geared towards adding packages to RHEL, and has strict guidelines that none of their packages replace anything in RHEL. IUS on the other hand is explicitly geared towards providing packages that do replace existing software in RHEL. Essentially, we are offering a proper way to upgrade software on RHEL when you really need it the latest upstream versions of software.
What Does IUS Stand For?¶
The acronym IUS stands for Inline with Upstream Stable. We also stand for world peace, and kittens.
Why can’t I just do a ‘yum upgrade’ and update my RPMs?¶
Why are IUS Packages named differently¶
There is great debate around the naming conventions used for IUS Packages. For example the equivalent of ‘mysql’ in IUS is mysql50, or mysql51, etc. The reason for this is simple, if the name of the package was the same as the stock package then as soon as you subscribed to the IUS Repositories your system would update nearly every package in the repo. This is what we call ‘bad ju-ju’. The majority of IUS users want to upgrade something specific like mysql, php, etc.; not everything. Additionally, the naming convention also allows us to offer multiple branches of software via the same repository as well. Meaning, you subscribe once and are always one install away from installing the latest that IUS has to offer.
The alternative is to maintain multiple repositories for every package set. So rather than having all packages in one repository, you would have a repository for php52, php53, mysql50, mysql51, python26, etc… not too mention all the supporting packages that might not warrant their own repository like php-pear18, or mysqlclient15.
Another major reason is for compatibility (or clarity) when mixing with other repos. for example when subscribing a RHEL box to EPEL, which has a number of php-pecl-XXX packages. All php-pecl packages in EPEL are built against stock php-5.1.6. If I introduced another repository with php-5.2.x in it and the packages were still named ‘php’ that would be quite confusing, not to mentioned incompatible since the php-pecl packages in EPEL wouldn’t work. Having an alternative name makes it clear that php52 is not php.
Long story short, from a packaging stand point, we have decided that this is the best way to maintain packages for IUS based on our package sets. Ease of installation might feel a bit janky or cumbersome, but if you look at it from the stance of long term use and supportability of IUS it really isn’t that bad.
Is IUS Right For Me?¶
Ask yourself these questions:
Am I a Rackspace Customer?¶
IUS is kind of like the ‘Fedora of Rackspace packages’. We’ve been offering similar services to Rackspace Hosting customers since late 2006. Please ask your AM or Support Team what packages and services are offered, rather than using IUS in your production. That said, for systems outside of Rackspace or for testing/dev environments IUS gives you a chance to try out the latest versions of software before it makes its way to Rackspace production.
Is there anyway to make my application work with stock RHEL packages?¶
If it is possible, stick with stock Red Hat packages. Thoroughly consider why you think you need upgraded versions that IUS provides and make a wise and educated decision.
Can I afford the risk?¶
IUS might introduce bugs/stability issues because it is bleeding edge versions of software. There is no way around that… so it is a give and take situation. You get the latest and greatest… but you also get to be one of the first people to find bugs before everyone else.
Am I upgrading software because I failed a PCI Security Scan?¶
Before jumping the gun and upgrading your packages because some ‘Security Professional’ or software told you too, don’t. Atleast not without further consideration. Red Hat uses a packaging model called ‘back porting’ where the security fixes are back-ported to older versions of software. Therefore, the PCI scan may fail but in fact the software is patched for the known vulnerability.
Always check the errata for the package in question, ensure you are updated to the latest, and verify if or if not that security vulnerability has been patched. You can read more about how Red Hat back-ports security fixes here:
Does Red Hat Support the Use of IUS Packages?¶
The idea behind IUS is to provide and maintain packages for RHEL (and other distros) that are inline with the latest versions of upstream software. So, if you upgrade say, php to our php52 packages and then try to obtain support from Redhat regarding PHP you will likely not get it.
There are two main reasons that most people want to use IUS: The first being that they absolutely need newer versions of software that RHEL does not provide, and the other being for people that need to do testing of upstream versions. Think of IUS as a better way to upgrade RHEL, if you really need to.
Do You Recommend IUS Over Stock RHEL Packages¶
No, not necessarily. We do not want to give the impression that our packages are better than those found in RHEL. Red Hat has teams of developers working tirelessly to ensure the stability and reliability of their packages. IUS does not have the resources to even begin to compete with the stability and quality of the official packages maintained by Red Hat. Plus, we are also following the latest and greatest sources from upstream directly which inevitably opens up a higher level of risk that those packages will introduce bugs.
IUS is recommended for users that absolutely need newer versions of specific software than RHEL can provide. IUS is not intended for users that want to update their entire OS. You don’t want to use IUS packages just because it ‘feels good’ or is ‘cool’ to have newer software. Though, don’t get me wrong, IUS is pretty cool.
IUS solves the problem of: “How do I upgrade software on my RHEL machine, and keep that software updated and maintained for bugs/security issues?” You can look all over the internets and see dozens of ‘how-to’ articles where people explain how they upgraded PHP/MySQL/etc. on their RHEL server. But how many do you find that explain how they keep that version of PHP/MySQL/etc. updated and patched? Not many, until now.
Does IUS Cost Anything?¶
Nope, but we do ask that if you’ve found IUS useful that you drop us a line and say hi or blog about it to get the word out for us.
Development and Packaging Questions¶
How Can I Contribute to IUS¶
Currently the best way to contribute is by providing feedback of testing and stable packages. Our main goal is to provide stable packages using the latest upstream sources which can be difficult. By users reporting any issues/bugs they come across right away, we can get those fixed and updated packages pushed out asap. That said, please also see Contributing to IUS on the wiki.
How Do I Install Packages From Testing?¶
When packages are tagged as ‘testing’ in our buildfarm they are added to the testing repository. If you have installed the ius-release package then you already have this repo configured in yum, but disabled by default. Simply issue the following command for the package(s) you want to install from testing:
[root@linuxbox ~]# yum install PACKAGE_NAME --enablerepo=ius-testing
How Can I Become a Packager?¶
Currently we are not opening up access for packagers outside of the IUS Core Development Team, which is currently the Engineers at Rackspace that are leading IUS. This is primarily due to the fact that our buildsystem is not publicly available. It is something that we are going to open up later on once IUS is fully vetted and all processes and documentation have been figured out, and of course once we get a public build system setup. For the time being we graciously request that you submit patches or SRPMS via the bug tracking system. See our IUS Developer Guide on the wiki for info on branching the Bazaar repos and creating merge requests.
What Packaging System Do You Use?¶
We built a system called MonkeyFarm that functions much like Fedora Koji. We make no attempt to compete with Koji in that department, however there were other needs for a ‘build system’ outside of RPM packaging that lead us to continue work on our own. Additionally, the preceptor to MonkeyFarm was RPE (The Rackspace Packaging Environment) which was started before Koji was released publicly (and before we knew about it).