The ambari agent communicates with the ambari server and provides all the necessary information required to the ambari-server. This post outlines the steps to install and configure the ambari agent. The ambari agents need to be installed in all the nodes in the HDP cluster.
1. Simlar to ambari-agent installation, first we will have to download the ambari repository file.
# wget -nv http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.1.0/ambari.repo -O /etc/yum.repos.d/ambari.repo 2018-06-27 17:14:55 URL:http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.1.0/ambari.repo [280/280] -> "/etc/yum.repos.d/ambari.repo" [1]
You can get the latest ambari repository from here : https://docs.hortonworks.com/HDPDocuments/Ambari-2.1.0.0/bk_Installing_HDP_AMB/content/_ambari_repositories.html
2. Verify the ambari repo file:
# cat /etc/yum.repos.d/ambari.repo #VERSION_NUMBER=2.1.0-1470 [Updates-ambari-2.1.0] name=ambari-2.1.0 - Updates baseurl=http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.1.0 gpgcheck=1 gpgkey=http://public-repo-1.hortonworks.com/ambari/centos7/RPM-GPG-KEY/RPM-GPG-KEY-Jenkins enabled=1 priority=1
3. To install the ambari agent on CentOS/RHEL 7 server use the yum package manager:
# yum install ambari-agent
Configuring ambari agent
The ambari agent use the configuration file /etc/ambari-agent/conf/ambari-agent.ini to configure all the settings in cluster nodes. For now just change the hostname to the ambari-server hostname in this configuration file.
# vim /etc/ambari-agent/conf/ambari-agent.ini
[server]
hostname=ambari-server.mylabserver.com
url_port=8440
secured_url_port=8441 Start / Stop Ambari-agent
You can check the current status of the ambari agent using the command “ambari-agent status”:
# ambari-agent status ambari-agent currently not running
To start the ambari-agent:
# ambari-agent start Verifying Python version compatibility... Using python /usr/bin/python2.7 Checking for previously running Ambari Agent... Starting ambari-agent Verifying ambari-agent process status... Ambari Agent successfully started Agent PID at: /var/run/ambari-agent/ambari-agent.pid Agent out at: /var/log/ambari-agent/ambari-agent.out Agent log at: /var/log/ambari-agent/ambari-agent.log
Verify the status again:
# ambari-agent status Found ambari-agent PID: 2283 ambari-agent running. Agent PID at: /var/run/ambari-agent/ambari-agent.pid Agent out at: /var/log/ambari-agent/ambari-agent.out Agent log at: /var/log/ambari-agent/ambari-agent.log
To stop the ambari-agent:
# ambari-agent stop Verifying Python version compatibility... Using python /usr/bin/python2.7 Found ambari-agent PID: 2195 Stopping ambari-agent Removing PID file at /var/run/ambari-agent/ambari-agent.pid ambari-agent successfully stopped