How does ambari server calculates UID while creating new local user? Here is the situation: One of my customer has a node synced to LDAP, while installing hadoop client, it throws below error because UID conflicts with LDAP user. This is strange! Does anybody knows from where ambari-server/ambari-agent picks next available UID? Does it read /etc/login.defs? I tried changing range over there as well, did not help! Here is an error for your reference: stderr: /var/lib/ambari-agent/data/errors-21613.txt Traceback (most recent call last): File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/hook.py", line 35, in <module> BeforeAnyHook().execute() File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 329, in execute method(env) File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/hook.py", line 29, in hook setup_users() File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/shared_initialization.py", line 51, in setup_users fetch_nonlocal_groups = params.fetch_nonlocal_groups, File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 166, in __init__ self.env.run() File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 160, in run self.run_action(resource, action) File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 124, in run_action provider_action() File "/usr/lib/python2.6/site-packages/resource_management/core/providers/accounts.py", line 84, in action_create shell.checked_call(command, sudo=True) File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 72, in inner result = function(command, **kwargs) File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 102, in checked_call tries=tries, try_sleep=try_sleep, timeout_kill_strategy=timeout_kill_strategy) File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 150, in _call_wrapper result = _call(command, **kwargs_copy) File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 303, in _call raise ExecutionFailed(err_msg, code, out, err) resource_management.core.exceptions.ExecutionFailed: Execution of 'useradd -m -u 1001 -G hadoop -g hadoop streamline' returned 4. useradd: UID 1001 is not unique Error: Error: Unable to run the custom hook script ['/usr/bin/python', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY/scripts/hook.py', 'ANY', '/var/lib/ambari-agent/data/command-21613.json', '/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/before-ANY', '/var/lib/ambari-agent/data/structured-out-21613.json', 'INFO', '/var/lib/ambari-agent/tmp', 'PROTOCOL_TLSv1', ''] Note - UID 1001 is assigned to some other user which is managed by LDAP. Please help! Ambari server is running as non root user. ... View more