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This tutorial will demonstrate how to install OpenResty on CentOS 8 via dnf.

We’ll use this fresh install of CentOS 8 in this tutorial.

We can always goto the openresty.org web site to find the instructions.

Then click on the Installation link on the left side bar.

And click on the link “official pre-built packages” under the “Binary Packages” section.

As we can see here, we do support a lot of different Linux distributions.

Scroll down to the CentOS section.

We can find all the commands for enabling the yum repository and installing the OpenResty rpm packages.

Back to our CentOS 8 system, first install the standard wget package if you don’t have it already.

sudo dnf -y install wget

Use wget to download the openresty.repo file from our site.

wget 'https://openresty.org/package/centos/openresty.repo'

We move this file into the yum repositories’ configuration directory.

sudo mv openresty.repo /etc/yum.repos.d/

Note that we need sudo here.

We update the yum index database.

sudo dnf check-update

Now it’s time to install our main RPM package, openresty.

sudo dnf -y install openresty

Check if the openresty executable is available.

which openresty

This openresty executable is just a symbolic link.

file `which openresty`

And check its version.

openresty -V

We can start the default openresty server like this.

sudo systemctl start openresty

Check if the nginx processes are up and running.

ps aux|grep nginx

Perfect.

Test the default home page with the curl command.

curl 127.0.0.1/

Yay, it’s working.

Note, however, that the resty command-line utility is not installed yet.

which resty

If you want it, then you can install the openresty-resty RPM package from the same repository.

sudo dnf -y install openresty-resty

Now it should be ready.

which resty
resty -e 'print("Hello Resty")'

Similarly, if you want to use the restydoc command-line utility, you should install the openresty-doc package.

sudo dnf -y install openresty-doc

Now it’s available too. Try it out!

restydoc -s content_by_lua_file

We can also install OPM for installing more Lua modules contributed by the OpenResty community.

sudo dnf -y install openresty-opm

We can try installing the lua-resty-http library authored by James Hurst.

sudo opm get pintsized/lua-resty-http

Try loading it with the resty utility.

resty -e 'require "resty.http"'

Success!

There is also a debug build of OpenResty which includes debugging logs and all the internal assertions enabled.

sudo dnf -y install openresty-debug

We can invoke this debug version of openresty like this.

which openresty-debug

This openresty-debug executable is also a symbolic link.

file `which openresty-debug`

We should never use it in production since it is much slower than the release build.

Furthermore, there are also special builds for checking memory issues via Valgrind and Address Sanitizer.

sudo dnf list openresty-valgrind openresty-asan

Try these when you have memory issues to debug. We may cover these in future tutorials.

To upgrade OpenResty packages to their latest versions, just run these commands.

sudo dnf check-update
sudo dnf upgrade 'openresty*'

To check all the available packages in our openresty repository.

dnf --disablerepo='*' --enablerepo="openresty" list available

We’ve got a lot of packages here.

We can find detailed documentation for all these RPM packages on the web page openresty.org/en/rpm-packages.html.

We have indeed got a lot of packages for the user to choose from.

That’s all I’d like to cover today. Have fun!

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About The Author

Yichun Zhang (Github handle: agentzh), is the original creator of the OpenResty^® open-source project and the CEO of OpenResty Inc..

Yichun is one of the earliest advocates and leaders of “open-source technology”. He worked at many internationally renowned tech companies, such as Cloudflare, Yahoo!. He is a pioneer of “edge computing”, “dynamic tracing” and “machine coding”, with over 22 years of programming and 16 years of open source experience. Yichun is well-known in the open-source space as the project leader of OpenResty^®, adopted by more than 40 million global website domains.

OpenResty Inc., the enterprise software start-up founded by Yichun in 2017, has customers from some of the biggest companies in the world. Its flagship product, OpenResty XRay, is a non-invasive profiling and troubleshooting tool that significantly enhances and utilizes dynamic tracing technology. And its OpenResty Edge product is a powerful distributed traffic management and private CDN software product.

As an avid open-source contributor, Yichun has contributed more than a million lines of code to numerous open-source projects, including Linux kernel, Nginx, LuaJIT, GDB, SystemTap, LLVM, Perl, etc. He has also authored more than 60 open-source software libraries.