1. recovery

vi /etc/my.cnf.d/mariadb-server.cnf
///
[mysqld]
///
innodb_force_recovery = 4 # 0
///
rm /var/lib/mysql/mysql.sock
mkdir -p /var/run/mariadb
chown mysql: /var/run/mariadb/
systemctl start mariadb.service
mariadb-check -u root -pPassw0rd --all-databases --auto-repair --verbose
Processing databases
cid
cid.hosts                                          OK
hadb004
hadb004.event_data                                 OK
hadb004.event_types                                OK
hadb004.events                                     OK
hadb004.migration_changes                          OK
hadb004.recorder_runs                              OK
hadb004.schema_changes                             OK
hadb004.state_attributes                           OK
hadb004.states                                     OK
hadb004.states_meta                                OK
hadb004.statistics                                 OK
hadb004.statistics_meta                            OK
hadb004.statistics_runs                            OK
hadb004.statistics_short_term                      OK
information_schema
insdb
mysql
mysql.column_stats                                 OK
mysql.columns_priv                                 OK
mysql.db                                           OK
mysql.event                                        OK
mysql.func                                         OK
mysql.global_priv                                  OK
mysql.gtid_slave_pos                               OK
mysql.help_category                                OK
mysql.help_keyword                                 OK
mysql.help_relation                                OK
mysql.help_topic                                   OK
mysql.index_stats                                  OK
mysql.innodb_index_stats                           OK
mysql.innodb_table_stats                           OK
mysql.plugin                                       OK
mysql.proc                                         OK
mysql.procs_priv                                   OK
mysql.proxies_priv                                 OK
mysql.roles_mapping                                OK
mysql.servers                                      OK
mysql.table_stats                                  OK
mysql.tables_priv                                  OK
mysql.time_zone                                    OK
mysql.time_zone_leap_second                        OK
mysql.time_zone_name                               OK
mysql.time_zone_transition                         OK
mysql.time_zone_transition_type                    OK
mysql.transaction_registry                         OK
performance_schema
sys
sys.sys_config                                     OK