Zabbix server is not running after package installations

[maddy_in65]

Zabbix server was running smoothly from quite long time. In last week, i have installed "Zabbix-get" package but after that server went down.
I am getting error "Server is not running" and logs shows Database authentication error. It looks like logs also not get generated after server was down.

696:20180312:002856.517 database is down: reconnecting in 10 seconds
696:20180312:002906.617 [Z3001] connection to database 'zabbix' failed: [0] FATAL:  password authentication failed for user "zabbix"
FATAL:  password authentication failed for user "zabbix"

I have checked sever config and matched with mysql password and looks good. I also changed DBuser in sever.conf to see any new log but i didnt see new error in log.
server config:

DBName=zabbix
DBUser=zabbix
DBPassword=MyDBPassword
DBSocket=/var/run/mysqld/mysqld.sock

zabbix-server.service - LSB: Start zabbix-server daemon
   Loaded: loaded (/etc/init.d/zabbix-server; generated; vendor preset: enabled)
   Active: active (exited) since Thu 2018-03-15 23:14:43 IST; 1 day 9h ago
     Docs: man:systemd-sysv-generator(8)
  Process: 907 ExecStart=/etc/init.d/zabbix-server start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/zabbix-server.service

Mar 15 23:14:43  systemd[1]: Starting LSB: Start zabbix-server daemon...
Mar 15 23:14:43 systemd[1]: Started LSB: Start zabbix-server daemon.

I am able to login to Mysql DB with both root and zabbix user.

sudo mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 634
Server version: 10.1.23-MariaDB-9+deb9u1 Raspbian 9.0

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

mysql -u zabbix -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 689
Server version: 10.1.23-MariaDB-9+deb9u1 Raspbian 9.0

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

I did lot of googling, tried to fix the issue but still no luck. Appreciate if someone help me with this issue.
Thank you in advance.

[maddy_in65]

Anyone, please help me with this issue.

[huangyingja]

maybe just " 696:20180312:002856.517 database is down: reconnecting in 10 seconds "
can you check DB logs ?

[maddy_in65]

maybe just " 696:20180312:002856.517 database is down: reconnecting in 10 seconds "
can you check DB logs ?

Yes I have checked, dont find any error there. The log generation stopped after zabbix server was down.

2018-03-10  9:44:53 1988460544 [Note] Server socket created on IP: '127.0.0.1'.
2018-03-10  9:44:53 1988460544 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.1.23-MariaDB-9+deb9u1'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  Raspbian 9.0

[aigars.kadikis]

almost sound like an free disk space issue. Please check it with df -h