Created attachment 957214 [details]
Launch datanode under root user, add necessary environment.
Description of problem:
For secure mode to be enabled in Hadoop cluster, there are needed some (rather small?) changes in packaging:
1) /usr/bin/container-executor must be owned by group used for starting the nodemanager daemon (it could be 'yarn', but upstream documentation mentions 'hadoop')
2) datanode must be launched under root (it will use jsvc and drop privileges). There are needed also some environment variables.
Version-Release number of selected component (if applicable):
Enabling security is described here: http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/SecureMode.html
I used these properties in /etc/hadoop/*-site.xml files:
hadoop.security.authentication => kerberos
dfs.block.access.token.enable => true
yarn.nodemanager.container-executor.class => org.apache.hadoop.yarn.server.nodemanager.LinuxContainerExecutor
yarn.nodemanager.linux-container-executor.group => hadoop
And edited /etc/hadoop/container-executor.cfg file.
Hadoop datanode daemon rejects to activate secure mode (logged in /var/log/hadoop-*/*.log).
Hadoop nodemanager won't launch with the container. There is also other way, how to check this:
runuser yarn -s /bin/bash /bin/bash -c 'container-executor --checksetup'
No changes needed in unit files and owerships to activate secure mode.
Patches for hadoop package attached. It works in both modes - without security and with security enabled.
Packages with the patches built also in COPR:
Created attachment 957216 [details]
Change owner of container-executor to nodemanager daemon group.
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