[Linux|SQL] ERROR 2002 해결
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/usr/local/poscodx2023/mariadb/tmp/mariadb.sock’ (111 “Connection refused”)
문제 발생 이유
join과 같은 잘못된 쿼리문을 다수 보내면, 디스크에 까지 100%로 사용하게되고 에러가 발생한다.
[root@lx ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 930044 0 930044 0% /dev
tmpfs 940936 4 940932 1% /dev/shm
tmpfs 940936 8712 932224 1% /run
tmpfs 940936 0 940936 0% /sys/fs/cgroup
/dev/sda3 37205252 37205232 20 100% /
/dev/sda1 520868 163944 356924 32% /boot
tmpfs 188188 0 188188 0% /run/user/1000
해결방법1 : 재부팅
[root@lx bin]# sync
[root@lx bin]# sync
[root@lx bin]# sync
[root@lx bin]# reboot
- 여전히 해결이 안됨.
[root@lx ~]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 930044 0 930044 0% /dev
tmpfs 940936 4 940932 1% /dev/shm
tmpfs 940936 8712 932224 1% /run
tmpfs 940936 0 940936 0% /sys/fs/cgroup
/dev/sda3 37205252 37205232 20 100% /
/dev/sda1 520868 163944 356924 32% /boot
tmpfs 188188 0 188188 0% /run/user/1000
[root@lx ~]# systemctl stop mysqld
Failed to stop mysqld.service: Unit mysqld.service not loaded.
해결방법2 : temp 파일의 삭제
[root@lx ~]# cd /tmp
[root@lx tmp]# ls -l
합계 28900108
-rw-rw----. 1 mysql mysql 29648748544 8월 31 17:42 #sql_3ec_0.MAD
-rw-rw----. 1 mysql mysql 8192 8월 31 16:12 #sql_3ec_0.MAI
drwxr-xr-x. 2 root root 6 9월 1 08:29 hsperfdata_root
-rwx------. 1 root root 836 8월 23 09:49 ks-script-bKlNgN
drwx------. 3 root root 17 8월 31 11:01 systemd-private-3fa1909e518f4f0697e53a486f33e4fb-chronyd.service-ka5HET
drwx------. 3 root root 17 8월 31 08:59 systemd-private-5b9327924000485da20cb861686b2b66-chronyd.service-qlJjeN
drwx------. 3 root root 17 8월 30 08:55 systemd-private-6151dee7b070437b8ad6a30db51ffcab-chronyd.service-NPZx3A
drwx------. 3 root root 17 8월 29 08:53 systemd-private-86194cd49b7a4fdc92d41ec375d70b26-chronyd.service-3VhSyp
drwx------. 3 root root 17 8월 30 12:37 systemd-private-8dafb436ba8246c0b3da2c37133b69de-chronyd.service-1qF1PB
drwx------. 3 root root 17 8월 25 15:44 systemd-private-dd1cdac534c44e9ca7573abab1d23855-chronyd.service-Kpo9mr
drwx------. 3 root root 17 8월 23 10:26 systemd-private-df6fab686b874956b26583687bbce894-chronyd.service-bFPVeu
drwx------. 3 root root 17 8월 28 15:33 systemd-private-eb5a05a07ed04293bf560c227faff1f2-chronyd.service-8eV9zt
drwx------. 3 root root 17 8월 24 09:02 systemd-private-f0cabd56b2b44908be4a52154efc65d8-chronyd.service-SNDr1t
-rw-------. 1 root root 0 8월 23 09:45 yum.log
[root@lx tmp]#
[root@lx tmp]# rm -rf *
[root@lx tmp]# ls -l
합계 0
[root@lx tmp]#
[root@lx tmp]#
[root@lx tmp]#
[root@lx tmp]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 930044 0 930044 0% /dev
tmpfs 940936 4 940932 1% /dev/shm
tmpfs 940936 8712 932224 1% /run
tmpfs 940936 0 940936 0% /sys/fs/cgroup
/dev/sda3 37205252 8305120 28900132 23% /
/dev/sda1 520868 163944 356924 32% /boot
tmpfs 188188 0 188188 0% /run/user/1000
[root@lx tmp]#
해결 확인
[root@lx ~]# systemctl start mariadb
[root@lx ~]# ps -ef | grep mysqld
root 1439 1 0 10:10 ? 00:00:00 /bin/sh /usr/local/poscodx2023/mariadb/bin/mysqld_safe --datadir=/usr/local/poscodx2023/mariadb/data --pid-file=/usr/local/poscodx2023/mariadb/data/lx.yewon.com.pid
mysql 1516 1439 5 10:10 ? 00:00:00 /usr/local/poscodx2023/mariadb/bin/mysqld --basedir=/usr/local/poscodx2023/mariadb --datadir=/usr/local/poscodx2023/mariadb/data --plugin-dir=/usr/local/poscodx2023/mariadb/lib/plugin --user=mysql --log-error=/usr/local/poscodx2023/mariadb/data/lx.yewon.com.err --pid-file=/usr/local/poscodx2023/mariadb/data/lx.yewon.com.pid
root 1549 1259 0 10:10 pts/0 00:00:00 grep --color=auto mysqld