@Hpc We see the error in determining the "server_url" UnboundLocalError: local variable 'server_url' referenced before assignment ==================== In general this error can occur if the ambari agent process is somehow not able to determine the ambari server Host & Port information. So please check if the ambari Hostname is resolvable from the Agent machine? Like looking at the "/etc/hosts" file on agent to see if Ambari Server IP and Hostname is mapped properly and reachable? We can also try connecting to Ambari Server host using telnet to see hostname and port resolution: (From agent machine w can run) Try using ambari server hostname (FQDN) and IP address both. # telnet $AMBARI_SERVER_HOSTNAME 8080 (OR) # nc -v $AMBARI_SERVER_HOSTNAME 8080 . We see that the problem is because of the above error. Ambari Agent is not able to determine the ambari-server hostname (URL). This can happen if the "/etc/ambari-agent/conf/ambari-agent.ini" file might have an invalid ambari server hostname. By any chance do you see that the timestamp of this file "/etc/ambari-agent/conf/ambari-agent.ini" is changed? Or some user (or any automated script) has mistakenly removed the "hostname" and ports from this file? . Looks like you might be using Ambari 2.4.2 (or 2.4.x) as we see the code here: https://github.com/apache/ambari/blob/release-2.4.2/ambari-agent/src/main/python/ambari_agent/main.py#L345-L355 for server_hostname in server_hostnames: try: server_ip = socket.gethostbyname(server_hostname) server_url = config.get_api_url(server_hostname) logger.info('Connecting to Ambari server at %s (%s)', server_url, server_ip) except socket.error: logger.warn("Unable to determine the IP address of the Ambari server '%s'", server_hostname) # Wait until MAX_RETRIES to see if server is reachable netutil = NetUtil(config, heartbeat_stop_callback) (retries, connected, stopped) = netutil.try_to_connect(server_url, MAX_RETRIES, logger) Ambari Agent determines the "server_url" as following: https://github.com/apache/ambari/blob/release-2.4.2/ambari-agent/src/main/python/ambari_agent/AmbariConfig.py#L249-L252 def get_api_url(self, server_hostname): return "%s://%s:%s" % (self.CONNECTION_PROTOCOL, server_hostname, self.get('server', 'url_port')) . So please check the "/etc/ambari-server/conf/ambari.properties" file as well to check if by any chance the "client.port" or "api.ssl" etc are changed recently? . ... View more

@Leonardo Apolonio We see the error as conflict between packages: file /usr/lib/python2.6/site-packages from install of ambari-agent-2.6.1.0-143.x86_64 conflicts with file from package ambari-server-2.6.1.0-0.x86_64 . This error indicates that you have AmbariServer package of version 2.6.1.0.0 but trying to install Ambari-Agent of version 2.6.1.0-143 (slightly higher). Which is causing the conflict. . Please check if you have duplicate ambari repos like (2.6.1.0-143 as well as 2.6.1.0.0 both) on the same host? In that case remove the Old unwanted ambari repo from the mentioned dir and then perform a yum clean. # grep baseurl /etc/yum.repos.d/* | grep ambari So can you please try this: # yum clean all . Then retry the agent installation or try the "yum upgrade ambari-server" first and then upgrade the agent. # sudo yum upgrade ambari-server # sudo yum upgrade ambari-agent . ... View more

@Biliyaminu Umar As there are multiple metricsNames there is no common way to sort them out in meaningful/useful form so they are random. ... View more