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Redhat / CentOS

Install on Redhat / CentOS

Fluent Bit is distributed as fluent-bit package and is available for the latest stable CentOS system.

The following architectures are supported

  • x86_64

  • aarch64 / arm64v8

For CentOS 9+ we use CentOS Stream as the canonical base system.

Single line install

A simple installation script is provided to be used for most Linux targets. This will always install the most recent version released.

curl https://raw.githubusercontent.com/fluent/fluent-bit/master/install.sh | sh

This is purely a convenience helper and should always be validated prior to use. The recommended secure deployment approach is to follow the instructions below.

CentOS 8

CentOS 8 is now EOL so the default Yum repositories are unavailable.

Make sure to configure to use an appropriate mirror, for example:

$ sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* && \
  sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

An alternative is to use Rocky or Alma Linux which should be equivalent.

Configure Yum

We provide fluent-bit through a Yum repository. In order to add the repository reference to your system, please add a new file called fluent-bit.repo in /etc/yum.repos.d/ with the following content:

[fluent-bit]
name = Fluent Bit
baseurl = https://packages.fluentbit.io/centos/$releasever/$basearch/
gpgcheck=1
gpgkey=https://packages.fluentbit.io/fluentbit.key
repo_gpgcheck=1
enabled=1

It is best practice to always enable the gpgcheck and repo_gpgcheck for security reasons. We sign our repository metadata as well as all of our packages.

Updated key from March 2022

The GPG Key fingerprint of the new key is:

C3C0 A285 34B9 293E AF51  FABD 9F9D DC08 3888 C1CD
Fluentbit releases (Releases signing key) <releases@fluentbit.io>

The GPG Key fingerprint of the old key is:

F209 D876 2A60 CD49 E680 633B 4FF8 368B 6EA0 722A

Install

Once your repository is configured, run the following command to install it:

yum install fluent-bit

Now the following step is to instruct Systemd to enable the service:

sudo service fluent-bit start

If you do a status check, you should see a similar output like this:

$ service fluent-bit status
Redirecting to /bin/systemctl status  fluent-bit.service
● fluent-bit.service - Fluent Bit
   Loaded: loaded (/usr/lib/systemd/system/fluent-bit.service; disabled; vendor preset: disabled)
   Active: active (running) since Thu 2016-07-07 02:08:01 BST; 9s ago
 Main PID: 3820 (fluent-bit)
   CGroup: /system.slice/fluent-bit.service
           └─3820 /opt/fluent-bit/bin/fluent-bit -c etc/fluent-bit/fluent-bit.conf
...

The default configuration of fluent-bit is collecting metrics of CPU usage and sending the records to the standard output, you can see the outgoing data in your /var/log/messages file.

FAQ

Yum install fails with a "404 - Page not found" error for the package mirror

The fluent-bit.repo file for the latest installations of Fluent-Bit uses a $releasever variable to determine the correct version of the package to install to your system:

[fluent-bit]
name = Fluent Bit
baseurl = https://packages.fluentbit.io/centos/$releasever/$basearch/
...

Depending on your Red Hat distribution version, this variable may return a value other than the OS major release version (e.g., RHEL7 Server distributions return "7Server" instead of just "7"). The Fluent-Bit package url uses just the major OS release version, so any other value here will cause a 404.

In order to resolve this issue, you can replace the $releasever variable with your system's OS major release version. For example:

[fluent-bit]
name = Fluent Bit
baseurl = https://packages.fluentbit.io/centos/7/$basearch/
gpgcheck=1
gpgkey=https://packages.fluentbit.io/fluentbit.key
repo_gpgcheck=1
enabled=1

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