O MariaDB parou e não reinicia

Olá Colegas,
Cenário: Cloud Server Nanode (Linode 1GB + 1CPU), Ubuntu 16.04, Apache2, MariaDB, PHP7.0. Apontei 8 domínios para ele, cada um com seu devido Virtual Host, sua pasta public_html, seu site WP e respectivos bancos de dados.

Um belo dia acessando um dos sites recebo a mensagem "Erro ao estabelecer uma conexão com o banco de dados" (O Apache2 está normal). Voltei ao SSH depois de meses e tentei dar um restar no mysql (usei todas as versões do comando que conheço e algumas que não conheço). Até já reiniciei o servidor. Não funcionou.

O systemctl status só disse "Falied to star LSB: Start and stop the mysql database server daemon." e "Can't connect to local MySQL server through socket /run/mysqld/mysqld.sock". Já adianto que o mysqld.sock não existe e o journalctl -xe não forneceu nenhuma informação de erro. Acredito que tenha a ver com aquela renovação automática do Let's Encrypt, pois foi a única interferência que ocorreu no servidor entre minha última logada no SSH e a morte do MySQL.

Alguém sabe como resolvo isso? Ou (mais drástico) é possível localizar uma "planilha" dos bancos e importar em outro mysql para que eu possa recuperar os dados e formatar o servidor?

Obrigado

Como está o espaço disponibilizado pela o banco de dados?

Não sei. Como faço para verificar isso?

qual o espaço em disco do servidor ?

digita ai

df -h 



 

posta ai a saída do comando

journalctl -xe



 

Last login: Fri Aug 23 16:15:40 2019 from 189.110.139.207
root@localhost:~# sudo service mysql start
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
root@localhost:~# sudo service mysql start
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
root@localhost:~# journalctl -xe
Aug 23 16:20:31 localhost mysqld[11359]: 190823 16:20:31 [ERROR] Aborting
Aug 23 16:20:31 localhost mysqld[11359]:
Aug 23 16:20:31 localhost mysqld[11359]: 190823 16:20:31 [Note] InnoDB: FTS optimize thread exiting.
Aug 23 16:20:31 localhost mysqld[11359]: 190823 16:20:31 [Note] InnoDB: Starting shutdown...
Aug 23 16:20:32 localhost mysqld[11359]: 190823 16:20:32 [Note] InnoDB: Waiting for page_cleaner to finish flushing of buffer pool
Aug 23 16:20:34 localhost mysqld[11359]: 190823 16:20:34 [Note] InnoDB: Shutdown completed; log sequence number 273791562
Aug 23 16:20:34 localhost mysqld[11359]: 190823 16:20:34 [Note] /usr/sbin/mysqld: Shutdown complete
Aug 23 16:20:34 localhost mysqld[11359]:
Aug 23 16:20:34 localhost mysqld_safe[11402]: mysqld from pid file /var/run/mysqld/mysqld.pid ended
Aug 23 16:20:56 localhost sshd[11583]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.65 user=root
Aug 23 16:20:58 localhost sshd[11583]: Failed password for root from 49.88.112.65 port 33518 ssh2
Aug 23 16:21:01 localhost sshd[11583]: Failed password for root from 49.88.112.65 port 33518 ssh2
Aug 23 16:21:01 localhost sshd[11639]: Invalid user famille from 37.203.208.3
Aug 23 16:21:01 localhost sshd[11639]: input_userauth_request: invalid user famille [preauth]
Aug 23 16:21:01 localhost sshd[11639]: pam_unix(sshd:auth): check pass; user unknown
Aug 23 16:21:01 localhost sshd[11639]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=37.203.208.3
Aug 23 16:21:02 localhost /etc/init.d/mysql[11667]: 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in
Aug 23 16:21:02 localhost /etc/init.d/mysql[11667]: [61B blob data]
Aug 23 16:21:02 localhost /etc/init.d/mysql[11667]: error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")'
Aug 23 16:21:02 localhost /etc/init.d/mysql[11667]: Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!
Aug 23 16:21:02 localhost /etc/init.d/mysql[11667]:
Aug 23 16:21:02 localhost mysql[11185]: ...fail!
Aug 23 16:21:02 localhost systemd[1]: mysql.service: Control process exited, code=exited status=1
Aug 23 16:21:02 localhost sudo[11156]: pam_unix(sudo:session): session closed for user root
Aug 23 16:21:02 localhost systemd[1]: Failed to start LSB: Start and stop the mysql database server daemon.
-- Subject: Unit mysql.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit mysql.service has failed.
--
-- The result is failed.
Aug 23 16:21:02 localhost systemd[1]: mysql.service: Unit entered failed state.
Aug 23 16:21:02 localhost systemd[1]: mysql.service: Failed with result 'exit-code'.
Aug 23 16:21:03 localhost sshd[11583]: Failed password for root from 49.88.112.65 port 33518 ssh2
Aug 23 16:21:03 localhost sshd[11583]: Received disconnect from 49.88.112.65 port 33518:11: [preauth]
Aug 23 16:21:03 localhost sshd[11583]: Disconnected from 49.88.112.65 port 33518 [preauth]
Aug 23 16:21:03 localhost sshd[11583]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.88.112.65 user=root
Aug 23 16:21:03 localhost sshd[11639]: Failed password for invalid user famille from 37.203.208.3 port 43350 ssh2
Aug 23 16:21:03 localhost sshd[11639]: Received disconnect from 37.203.208.3 port 43350:11: Bye Bye [preauth]
Aug 23 16:21:03 localhost sshd[11639]: Disconnected from 37.203.208.3 port 43350 [preauth]
Aug 23 16:21:12 localhost sshd[11670]: Invalid user git from 177.220.175.82
Aug 23 16:21:12 localhost sshd[11670]: input_userauth_request: invalid user git [preauth]
Aug 23 16:21:12 localhost sshd[11670]: pam_unix(sshd:auth): check pass; user unknown
Aug 23 16:21:12 localhost sshd[11670]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=177.220.175.82
Aug 23 16:21:14 localhost sshd[11670]: Failed password for invalid user git from 177.220.175.82 port 47664 ssh2
Aug 23 16:21:14 localhost sshd[11670]: Received disconnect from 177.220.175.82 port 47664:11: Bye Bye [preauth]
Aug 23 16:21:14 localhost sshd[11670]: Disconnected from 177.220.175.82 port 47664 [preauth]
Aug 23 16:21:18 localhost sshd[11669]: Did not receive identification string from 134.175.89.186

root@localhost:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 476M 0 476M 0% /dev
tmpfs 100M 13M 87M 13% /run
/dev/sda 24G 3.6G 20G 16% /
tmpfs 497M 0 497M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 497M 0 497M 0% /sys/fs/cgroup
tmpfs 100M 0 100M 0% /run/user/0

tu chegou a alterar algo no arquivo de configuração do mysql ?

Não. Esse arquivo seria o mysqld.sock ou é outro?