Ubuntu
Fluent Bit is distributed as fluent-bit package and is available for the latest stable Ubuntu system: Focal Fossa.

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.
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curl https://raw.githubusercontent.com/fluent/fluent-bit/master/install.sh | sh
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If this fails or for more details on the installation then please refer to the specific sections below.

Server GPG key

The first step is to add our server GPG key to your keyring to ensure you can get our signed packages. Follow the official Debian wiki guidance: https://wiki.debian.org/DebianRepository/UseThirdParty#OpenPGP_Key_distribution
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curl https://packages.fluentbit.io/fluentbit.key | gpg --dearmor > /usr/share/keyrings/fluentbit-keyring.gpg
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Updated key from March 2022

From the 1.9.0 and 1.8.15 releases please note that the GPG key has been updated at https://packages.fluentbit.io/fluentbit.key so ensure this new one is added.
The GPG Key fingerprint of the new key is:
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C3C0 A285 34B9 293E AF51 FABD 9F9D DC08 3888 C1CD
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Fluentbit releases (Releases signing key) <[email protected]>
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The previous key is still available at https://packages.fluentbit.io/fluentbit-legacy.key and may be required to install previous versions.
The GPG Key fingerprint of the old key is:
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F209 D876 2A60 CD49 E680 633B 4FF8 368B 6EA0 722A
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Refer to the supported platform documentation to see which platforms are supported in each release.

Update your sources lists

On Ubuntu, you need to add our APT server entry to your sources lists, please add the following content at bottom of your /etc/apt/sources.list file - ensure to set CODENAME to your specific Ubuntu release name (e.g. focal for Ubuntu 20.04):
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deb [signed-by=/usr/share/keyrings/fluentbit-keyring.gpg] https://packages.fluentbit.io/ubuntu/${CODENAME} ${CODENAME} main
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Update your repositories database

Now let your system update the apt database:
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sudo apt-get update
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We recommend upgrading your system (sudo apt-get upgrade). This could avoid potential issues with expired certificates.

Install Fluent Bit

Using the following apt-get command you are able now to install the latest fluent-bit:
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sudo apt-get install fluent-bit
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Now the following step is to instruct systemd to enable the service:
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sudo service fluent-bit start
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If you do a status check, you should see a similar output like this:
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sudo service fluent-bit status
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● fluent-bit.service - Fluent Bit
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Loaded: loaded (/lib/systemd/system/fluent-bit.service; disabled; vendor preset: enabled)
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Active: active (running) since mié 2016-07-06 16:58:25 CST; 2h 45min ago
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Main PID: 6739 (fluent-bit)
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Tasks: 1
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Memory: 656.0K
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CPU: 1.393s
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CGroup: /system.slice/fluent-bit.service
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└─6739 /opt/fluent-bit/bin/fluent-bit -c /etc/fluent-bit/fluent-bit.conf
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...
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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/syslog file.