Unable to start migration with Plesk Migrator: rsync error: unexplained error

Symptoms

• Plesk Migrator fails to start a migration

  Failed to fetch basic information about resellers, clients and domains data from source servers
  Cause: Command execution failed on the local server with non-zero exit code.
  command: rsync -r --chmod=Fu=r,Du=rwx,go= --timeout=30 -e 'ssh -i /root/.ssh/id_rsa -p 22 -o PasswordAuthentication=no -o StrictHostKeyChecking=no -o GSSAPIAuthentication=no' /usr/local/psa/admin/plib/modules/panel-migrator/backend/lib/python/parallels/plesk/source/legacy/extras/plesk_17_0_pmm_shared/ root@203.0.113.2:/root/plesk_migrator/plesk_migrator-v1c5tj81ez33fks3axsor39rbz5o4ac3/pmm_agent
  exit code: 12
  stdout:
  stderr: rsync: ERROR: cannot stat destination "/root/plesk_migrator/plesk_migrator-v1c5tj81ez33fks3axsor39rbz5o4ac3/pmm_agent": Permission denied (13)
  rsync error: errors selecting input/output files, dirs (code 3) at main.c(554) [receiver=3.0.6]
  rsync: connection unexpectedly closed (247 bytes received so far) [sender]
  rsync error: error in rsync protocol data stream (code 12) at io.c(226) [sender=3.1.2]
  That is a critical error, migration was stopped.

• SELinux is in Enforcing mode on the source server

  # getenforce
  Enforcing

• The rsync SELinux boolean rsync_full_access is disabled or not available (CentOS 6, 7)

  # getsebool -a | grep rsync_full_access
  rsync_full_access --> off

• Root login fails with both SSH key and password

• These options are set in /etc/ssh/sshd_config

  • PubkeyAuthentication is set to on
  • PermitRootLogin is set to yes

Cause

SELinux blocks rsync command on source or target server.

Resolution

Temporarily allow rsync to run in SELinux (CentOS 7):

1. Log in to the source and/or target server over SSH

2. Enable the rsync SELinux boolean rsync_full_access

   # setsebool -P rsync_full_access=1

3. Run Plesk Migration

4. Disable the rsync SELinux boolean rsync_full_access

   # setsebool -P rsync_full_access=1