Too many connections 15155:20190823:052844.247 Cannot connect to the database. Exiting... 15220:20190823:052844.249 server #260 started [trapper #146] 15158:20190823:052844.249 Cannot connect to the database. Exiting... 15225:20190823:052844.251 server #264 started [trapper #150] 15224:20190823:052844.251 server #263 started [trapper #149] 15227:20190823:052844.254 server #266 started [trapper #152] 15206:20190823:052844.254 server #249 started [trapper #135] 15225:20190823:052844.256 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15225:20190823:052844.256 Cannot connect to the database. Exiting... 15170:20190823:052844.257 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15170:20190823:052844.257 Cannot connect to the database. Exiting... 15227:20190823:052844.258 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15227:20190823:052844.258 Cannot connect to the database. Exiting... 15214:20190823:052844.258 server #255 started [trapper #141] 15218:20190823:052844.259 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15218:20190823:052844.259 Cannot connect to the database. Exiting... 15207:20190823:052844.261 server #250 started [trapper #136] 15224:20190823:052844.261 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15224:20190823:052844.261 Cannot connect to the database. Exiting... 15206:20190823:052844.262 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15206:20190823:052844.262 Cannot connect to the database. Exiting... 15220:20190823:052844.263 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15220:20190823:052844.263 Cannot connect to the database. Exiting... 15212:20190823:052844.263 server #253 started [trapper #139] 15207:20190823:052844.265 [Z3001] connection to database 'zabbix' failed: [1040] Too many connections 15207:20190823:052844.265 Cannot connect to the database. Exiting... 14744:20190823:052844.266 One child process died (PID:14984,exitcode/signal:1). Exiting ... 15244:20190823:052844.312 server #267 started [trapper #153] 14744:20190823:052844.316 syncing trend data... 14744:20190823:052844.316 syncing trend data done 14744:20190823:052844.316 Zabbix Server stopped. Zabbix 4.2.5 (revision 2c0e4d1d39).
处理方法：修改mariadb最大连接数
配置/etc/my.cnf
[mysqld]下新添加一行如下参数：
max_connections=300
vi /usr/lib/systemd/system/mariadb.service
取消[Service]前的#号，
[Service]新添加两行如下参数：
LimitNOFILE=10000
LimitNPROC=10000
systemctl --system daemon-reload
systemctl restart mariadb.service