Getting this?

 root ? / ? data ? patroni ? systemctl status patroni
? patroni.service – Runners to orchestrate a high-availability PostgreSQL
   Loaded: loaded (/etc/systemd/system/patroni.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2020-07-12 17:52:48 EDT; 17s ago
 Main PID: 10991 (patroni)
   CGroup: /system.slice/patroni.service
           ??10991 /usr/bin/python2 /bin/patroni /etc/patroni.yml

Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 1184        C/9E000098        no recovery target specified
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 1185        C/BE662D30        no recovery target specified
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 1186        C/DE0BD128        no recovery target specified
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 1187        C/E0577308        no recovery target specified
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 1188        C/E20393C8        no recovery target specified
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 2020-07-12 17:53:04,277 INFO: starting as a secondary
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 2020-07-12 17:53:04,837 INFO: postmaster pid=11199
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: psql01.nix.mds.xyz:5432 – no response
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 2020-07-12 17:53:04,884 INFO: Lock owner: postgresql1; I am postgresql0
Jul 12 17:53:04 psql01.nix.mds.xyz patroni[10991]: 2020-07-12 17:53:04,891 INFO: failed to start postgres
 root ? / ? data ? patroni ?

Use this handy line to figure out why:

 root ? / ? data ? patroni ? log ? sudo su – postgres
Last login: Sun Oct 20 14:48:12 EDT 2019 on pts/0
-bash-4.2$ /usr/pgsql-10/bin/postgres -D /data/patroni –config-file=/data/patroni/postgresql.conf –listen_addresses=192.168.0.108 –max_worker_processes=8 –max_locks_per_transaction=64 –wal_level=replica –cluster_name=postgres –wal_log_hints=on –max_wal_senders=10 –track_commit_timestamp=off –max_prepared_transactions=0 –port=5432 –max_replication_slots=10 –max_connections=100 -d 5
2020-07-12 17:56:35.685 EDT [12071] FATAL:  data directory "/data/patroni" has group or world access
2020-07-12 17:56:35.685 EDT [12071] DETAIL:  Permissions should be u=rwx (0700).
2020-07-12 17:56:35.685 EDT [12071] DEBUG:  shmem_exit(1): 0 before_shmem_exit callbacks to make
2020-07-12 17:56:35.685 EDT [12071] DEBUG:  shmem_exit(1): 0 on_shmem_exit callbacks to make
2020-07-12 17:56:35.685 EDT [12071] DEBUG:  proc_exit(1): 0 callbacks to make
2020-07-12 17:56:35.685 EDT [12071] DEBUG:  exit(1)
-bash-4.2$ logout
 root ? / ? data ? patroni ? log ?

Fix it using:

 root ? / ? data ? chmod 700 patroni
 root ? / ? data ? systemctl restart patroni
 root ? / ? data ? 

Check the status:

 root ? / ? data ? systemctl status patroni
? patroni.service – Runners to orchestrate a high-availability PostgreSQL
   Loaded: loaded (/etc/systemd/system/patroni.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2020-07-12 17:57:10 EDT; 2min 36s ago
 Main PID: 12226 (patroni)
   CGroup: /system.slice/patroni.service
           ??12226 /usr/bin/python2 /bin/patroni /etc/patroni.yml
           ??12275 /usr/pgsql-10/bin/postgres -D /data/patroni –config-file=/data/patroni/postgresql.conf –hot_standby=on –listen_addre…
           ??12277 postgres: postgres: logger process
           ??12278 postgres: postgres: startup process   recovering 000004A50000000C000000E5
           ??12281 postgres: postgres: checkpointer process
           ??12282 postgres: postgres: writer process
           ??12283 postgres: postgres: stats collector process
           ??12287 postgres: postgres: postgres postgres 10.3.0.108(35052) idle

Jul 12 17:59:14 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:14,696 INFO: no action.  i am a secondary and i am following a leader
Jul 12 17:59:24 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:24,691 INFO: Lock owner: postgresql1; I am postgresql0
Jul 12 17:59:24 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:24,692 INFO: does not have lock
Jul 12 17:59:24 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:24,697 INFO: no action.  i am a secondary and i am following a leader
Jul 12 17:59:34 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:34,691 INFO: Lock owner: postgresql1; I am postgresql0
Jul 12 17:59:34 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:34,691 INFO: does not have lock
Jul 12 17:59:34 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:34,696 INFO: no action.  i am a secondary and i am following a leader
Jul 12 17:59:44 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:44,692 INFO: Lock owner: postgresql1; I am postgresql0
Jul 12 17:59:44 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:44,692 INFO: does not have lock
Jul 12 17:59:44 psql01.nix.mds.xyz patroni[12226]: 2020-07-12 17:59:44,699 INFO: no action.  i am a secondary and i am following a leader
 root ? / ? data ? 
 

HTH!  

Thx,
TK