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StackState version 4.4
Linux
Overview
StackState Agent V2
StackState Agent V2 can be installed on Linux systems running CentOS, Debian, Fedora, RedHat or Ubuntu. The Agent collects data from the host where it is running and can be configured to integrate with external systems. Retrieved data is pushed to StackState, to work with this data the StackState Agent V2 StackPack must be installed in your StackState instance. For details of the data retrieved and available integrations, see the StackPack integration documentation.
Setup
Supported versions
StackState Agent is tested to run on the Linux versions listed below with 64bit architecture. Note that host data for network connections between processes and containers (including network traffic telemetry) can only be retrieved for OS versions with a network tracer (kernel version 4.3.0 or higher):
Platform
Minimum version
Notes
CentOS
CentOS 6
CentOS 6 requires Agent v2.0.2 or above. Network tracer available from CentOS 8.
Debian
Debian 7 (Wheezy)
Debian 7 (Wheezy) requires glibc upgrade to 2.17. Network tracer available from Debian 9 (Stretch).
Fedora
Fedora 28
-
RHEL
RHEL 7
Network tracer available from RHEL 8.
Ubuntu
Ubuntu 15.04 (Vivid Vervet)
Network tracer available from Ubuntu 16.04 (LTS) (Xenial Xerus).
Install
StackState Agent V2 is installed using an install script.
​Online install - If you have access to the internet on the machine where the Agent will be installed. 
​Offline install - If you do not have access to the internet on the machine where the Agent will be installed.
The apiKey and baseUrl specified when running the install script are set during StackState installation, for details see:
​StackState Kubernetes install - configuration parameters 
​StackState Linux install - configuration parameters 
Online install
If you have access to the internet on the machine where the Agent will be installed, use one of the commands below to run the install.sh script. The Agent installer package will be downloaded automatically.
cURL
wget
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curl -o- https://stackstate-agent-2.s3.amazonaws.com/install.sh | \
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STS_API_KEY="{{config.apiKey}}" \
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STS_URL="{{config.baseUrl}}/stsAgent" bash
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wget -qO- https://stackstate-agent-2.s3.amazonaws.com/install.sh | \
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STS_API_KEY="{{config.apiKey}}" \
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STS_URL="{{config.baseUrl}}/stsAgent" bash
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Offline install
If you do not have access to the internet on the machine where the Agent will be installed, you will need to download both the install script and the Agent installer package before you install. You can then set the environment variable STS_INSTALL_NO_REPO=yes and specify the path to the downloaded installer package when you run the install.sh script.
1.Download the install script and copy this to the host where it will be installed:
​https://stackstate-agent-2.s3.amazonaws.com/install.sh​
2.Get the Key of the latest version of the Agent installer package (DEB or RPM package):
​DEB installer package list​
​RPM installer package list​
3.Download the Agent installer package and copy this to the host where it will be installed. The download link can be constructed from the S3 bucket URL and the installer package Key  that is provided on the installer package list page. 
For example, to download the DEB installer package for agent_2.13.0-1_amd64.deb, use:  https://stackstate-agent-2.s3.amazonaws.com/pool/stable/s/st/stackstate-agent_2.13.0-1_amd64.deb
DEB Download link: https://stackstate-agent-2.s3.amazonaws.com/<Key_from_DEB_installer_package_list>
RPM Download link: https://stackstate-agent-2-rpm.s3.amazonaws.com/<Key_from_RPM_installer_package_list>
4.Use the command below to set the required environment variables and run the installer script:
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 STS_API_KEY="{{config.apiKey}}" \
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 STS_URL="{{config.baseUrl}}/stsAgent" \
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 STS_INSTALL_NO_REPO=yes \
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 ./install.sh <path_to_local_Agent_installer_package>
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Upgrade
To upgrade StackState Agent V2 on your system, stop the stackstate-agent service and upgrade using yum or apt-get. To upgrade offline, download the Agent installer package (DEB or RPM package) and copy this to the host where it will be installed - see step 2 in the offline install instructions.
yum
apt-get
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# stop the Agent with one of the below commands
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sudo systemctl stop stackstate-agent
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sudo service stackstate-agent stop
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​
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# online Agent upgrade
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sudo yum upgrade stackstate-agent
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​
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# offline Agent upgrade
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sudo yum upgrade <agent_installer_package>.rpm
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# stop the Agent with one of the below commands
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sudo systemctl stop stackstate-agent
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sudo service stackstate-agent stop
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​
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# online Agent upgrade
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sudo apt-get update && apt-get upgrade stackstate-agent
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​
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# offline Agent upgrade
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sudo apt-get upgrade <agent_installer_package>.deb
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Configure
Agent configuration
The StackState Agent V2 configuration is located in the file /etc/stackstate-agent/stackstate.yaml. The apiKey and baseUrl specified during installation will be added here by the install script. No further configuration should be required, however, a number of advanced configuration options are available.
Advanced Agent configuration
A number of advanced configuration options are available for StackState Agent V2. These can be set in the Agent configuration file /etc/stackstate-agent/stackstate.yaml and are described in detail on the page advanced Agent configuration.
Integration configuration
The Agent can be configured to run checks that integrate with external systems. Configuration files for integrations run through StackState Agent V2 can be found in the directory /etc/stackstate-agent/conf.d/. Each integration has its own configuration file that is used by the associated Agent check.
Documentation for the available StackState integrations, including configuration details can be found on the StackPacks > Integrations pages.
Commands
Commands require elevated privileges.
Start, stop or restart the Agent
To manually start, stop or restart StackState Agent V2:
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# with systemctl
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sudo systemctl start stackstate-agent
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sudo systemctl stop stackstate-agent
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sudo systemctl restart stackstate-agent
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​
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# with service
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sudo service stackstate-agent start
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sudo service stackstate-agent stop
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sudo service stackstate-agent restart
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Status and information
To check if StackState Agent V2 is running and receive information about the Agent's state:
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# with systemctl
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sudo systemctl status stackstate-agent
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​
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# with service
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sudo service stackstate-agent status
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To show tracebacks for errors or output the full log:
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# with systemctl
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sudo journalctl -u stackstate-agent
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​
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# with service
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sudo service stackstate-agent status -v
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Manually run a check
Use the command below to manually run an Agent check.
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# Execute a check once and display the results.
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sudo -u stackstate-agent stackstate-agent check <CHECK_NAME>
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​
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# Execute a check once with log level debug and display the results.
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sudo -u stackstate-agent stackstate-agent check <CHECK_NAME> -l debug
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Troubleshooting
To troubleshoot the Agent, try to check the Agent status or manually run a check.
Log files
Logs for the subsystems are in the following files:
/var/log/stackstate-agent/agent.log
/var/log/stackstate-agent/process-agent.log
Support knowledge base
Troubleshooting steps for any known issues can be found in the StackState support knowledge base.
Uninstall
To uninstall StackState Agent V2 from your system, stop the stackstate-agent service and remove it using yum or apt-get.
yum
apt-get
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# stop the Agent with one of the below commands
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sudo systemctl stop stackstate-agent
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sudo service stackstate-agent stop
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​
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# uninstall the Agent
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sudo yum remove stackstate-agent
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# stop the Agent with one of the below commands
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sudo systemctl stop stackstate-agent
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sudo service stackstate-agent stop
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​
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# uninstall the Agent
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sudo apt-get remove stackstate-agent
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See also
​About the StackState Agent​
​Advanced Agent configuration  
​StackState Agent V2 StackPack​
​StackPack integration documentation​
​StackState Agent V2 (github.com)​