How we can sync up the ambari agents in other nodes after ambari upgrade?

[#1]

Hi Guys,

We are using 24 node cluster.

We have upgraded my Ambari-server and ambari agent in main server. How can i sync up the ambari agent in all other nodes.

Can someone please help us?

[#2 · Accepted solution]

@Narasimha Gunturu

You would need to upgrade the Ambari agent in other nodes as well. Check below link for details (point #7):

http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.2.0/bk_upgrading_Ambari/content/_upgrade_ambari....

Once agents are upgraded and started, they would sync up with Ambari server. All agents should be at same version as Ambari server

-Vivek

[#3]

@Narasimha Gunturu

On all host you need to do -

1. ambari-agent stop

2. #yum upgrade ambari-agent

3. ambari-agent restart

Thats sit.

[#4]

@Vivek,

If it is single digit nodes we can update the agent manually.

For example: If it is 500 Node cluster, is there any way to sync up the updated agent in all the nodes at a time?

[#5]

@Narasimha Gunturu

1. Just put the hostname/ipaddress in a file say - '/tmp/nodes'

2. use below command to run -

for i in `cat /tmp/nodes`; do ssh $i 'yum upgrade -y ambari-agent; /etc/init.d/ambari-agent restart'; done

-- [You might need to enter password if there is no passwordless ssh configured]

[#6]

@Narasimha Gunturu - In such cases, it is good to write a script to upgrade the agents across all nodes

For example:

key="/tmp/ambari-keypair"
for i in {1..5} ; do ssh -i $key -o StrictHostKeyChecking=no root@host-$i.mydomain ambari-agent stop ; done
repourl="http://public-repo-1.hortonworks.com/ambari/centos6/2.x/updates/2.2.2.0/ambari.repo"

for i in {1..5} ; do ssh -i $key root@host-$i.mydomain  wget -nv $repourl -O /etc/yum.repos.d/ambari.repo; done
for i in {1..5} ; do ssh -i $key root@host-$i.mydomain yum upgrade -y ambari-agent ; done
for i in {1..5} ; do ssh -i $key root@host-$i.mydomain ambari-agent start ; done

Here host-1.mydomain to host-5.mydomain are the five agent nodes and 'key' variable holds the ssh key to connect to those nodes from a central server (could be the Ambari server host)