How to set max_connections and max_replication_slots?

How to set max_connections and max_replication_slots? I’ve tried numerous ways, but no luck. Of course I googled as well but none of the suggestions I’m seeing are helping right now.

[root@psql02 patroni]# grep -Ei "max_replication_slots|max_connections" * 2>/dev/null
postgresql.base.conf:max_connections = 256                      # (change requires restart)
postgresql.base.conf:#max_replication_slots = 64        # max number of replication slots
postgresql.base.conf.backup:max_connections = 256                       # (change requires restart)
postgresql.base.conf.backup:#max_replication_slots = 64 # max number of replication slots
postgresql.conf:max_connections = '100'
postgresql.conf:max_replication_slots = '10'
postgresql.conf.backup:max_connections = '100'
postgresql.conf.backup:max_replication_slots = '10'
[root@psql02 patroni]#

Changes to /etc/patroni.xml don’t work either.

scope: postgres
namespace: /db/
name: postgresql0

restapi:
    listen: 192.168.0.108:8008
    connect_address: 192.168.0.108:8008

etcd:
    host: 192.168.0.108:2379

bootstrap:
    dcs:
        ttl: 30
        loop_wait: 10
        retry_timeout: 10
        maximum_lag_on_failover: 1048576
        postgresql:
            use_pg_rewind: true

    initdb:
    - encoding: UTF8
    - data-checksums

    pg_hba:
    - host replication replicator 127.0.0.1/32 md5
    - host replication replicator 192.168.0.108/0 md5
    - host replication replicator 192.168.0.124/0 md5
    - host replication replicator 192.168.0.118/0 md5
    - host all all 0.0.0.0/0 md5

    users:
        admin:
            password: admin
            options:
                - createrole
                - createdb

postgresql:
    listen: 192.168.0.108:5432
    bin_dir: /usr/pgsql-10/bin
    connect_address: 192.168.0.108:5432
    data_dir: /data/patroni
    pgpass: /tmp/pgpass
    unix_socket_directories: /data/patroni
    authentication:
        replication:
            username: replicator
            password: rep-pass
        superuser:
            username: postgres
            password: <SECRET>
    parameters:
        unix_socket_directories: '.'
        max_connections: '256'
        max_replication_slots: '64'

tags:
    nofailover: false
    noloadbalance: false
    clonefrom: false
    nosync: false

Trying to set it dynamically, fails with:

[root@psql01 patroni]# patronictl -c /etc/patroni.yml edit-config postgresql0

Traceback (most recent call last):
  File "/usr/bin/patronictl", line 11, in <module>
    load_entry_point('patroni==1.5.0', 'console_scripts', 'patronictl')()
  File "/usr/lib64/python2.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib64/python2.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib64/python2.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib64/python2.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/click/decorators.py", line 27, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/patroni/ctl.py", line 1114, in edit_config
    before_editing = format_config_for_editing(cluster.config.data)
AttributeError: 'NoneType' object has no attribute 'data'
[root@psql01 patroni]#

Appreciate any tips.