当我执行systemctl start mysql它时，它会启动 MySQL，但我没有得到命令提示符，它只是保持那样。数据库正常启动。几分钟后，数据库自动关闭，systemctl 报告失败。
我也尝试过systemctl start mysql --no-block立即恢复命令提示符，但几分钟后数据库再次关闭。
数据库没有崩溃，这是一次干净的关闭，所以我怀疑 systemctl 在一段时间后发出了关闭信号。
2014-10-30 20:03:37 7401 [Note] /usr/sbin/mysqld: Normal shutdown
已安装的 RPMS
Percona-XtraDB-Cluster-galera-3-debuginfo-3.7-1.3254.rhel7.x86_64
Percona-XtraDB-Cluster-56-debuginfo-5.6.20-25.7.888.el7.x86_64
Percona-XtraDB-Cluster-garbd-3-3.7-1.3254.rhel7.x86_64
Percona-XtraDB-Cluster-test-56-5.6.20-25.7.888.el7.x86_64
percona-release-0.1-3.noarch
Percona-XtraDB-Cluster-galera-3-3.7-1.3254.rhel7.x86_64
Percona-XtraDB-Cluster-client-56-5.6.20-25.7.888.el7.x86_64
percona-xtrabackup-2.2.5-5027.el7.x86_64
Percona-XtraDB-Cluster-server-56-5.6.20-25.7.888.el7.x86_64
Percona-XtraDB-Cluster-full-56-5.6.20-25.7.888.el7.x86_64
Percona-XtraDB-Cluster-shared-56-5.6.20-25.7.888.el7.x86_64
操作系统
CentOS Linux release 7.0.1406 (Core)
我如何确保 MySQl 不会关闭？
更新 1
[root@n5 ~]# systemctl start mysql (Time 23:31)
Job for mysql.service failed. See 'systemctl status mysql.service' and 'journalctl -xn' for details. (Time 23:46)
[root@n5 ~]#
[root@n5 ~]#
[root@n5 ~]# systemctl status mysql.service
mysql.service - Percona XtraDB Cluster
Loaded: loaded (/usr/lib/systemd/system/mysql.service; enabled)
Active: failed (Result: exit-code) since Thu 2014-10-30 23:46:47 MDT; 24min ago
Process: 22821 ExecStopPost=/usr/bin/mysql-systemd stop-post (code=exited, status=0/SUCCESS)
Process: 22778 ExecStop=/usr/bin/mysql-systemd stop (code=exited, status=2)
Process: 18202 ExecStartPost=/usr/bin/mysql-systemd start-post $MAINPID (code=exited, status=1/FAILURE)
Process: 18201 ExecStart=/usr/bin/mysqld_safe --basedir=/usr (code=exited, status=0/SUCCESS)
Process: 18168 ExecStartPre=/usr/bin/mysql-systemd start-pre (code=exited, status=0/SUCCESS)
Main PID: 18201 (code=exited, status=0/SUCCESS)
Oct 30 23:31:27 n5 rsyncd[19257]: sent 39 bytes received 181 bytes total size 48
Oct 30 23:46:29 n5 mysql-systemd[18202]: ERROR!
Oct 30 23:46:29 n5 systemd[1]: mysql.service: control process exited, code=exited status=1
Oct 30 23:46:29 n5 mysql-systemd[22778]: ERROR! mysql pid file /var/lib/mysql /var/lib/mysql/mysqld.pid empty or not readable
Oct 30 23:46:29 n5 mysql-systemd[22778]: WARNING: mysql may be already dead
Oct 30 23:46:29 n5 systemd[1]: mysql.service: control process exited, code=exited status=2
Oct 30 23:46:47 n5 mysqld_safe[18201]: 141030 23:46:47 mysqld_safe mysqld from pid file /var/lib/mysql/mysqld.pid ended
Oct 30 23:46:47 n5 mysql-systemd[22821]: SUCCESS!
Oct 30 23:46:47 n5 systemd[1]: Failed to start Percona XtraDB Cluster.
Oct 30 23:46:47 n5 systemd[1]: Unit mysql.service entered failed state.
来自 MySQL 日志
2014-10-30 23:31:49 19205 [Note] /usr/sbin/mysqld: ready for connections.
2014-10-30 23:46:29 19205 [Note] /usr/sbin/mysqld: Normal shutdown
来自消息日志
Oct 30 23:31:25 n5 mysql-systemd: /usr/bin/mysql-systemd: line 31: [: /var/lib: binary operator expected
Oct 30 23:31:25 n5 mysql-systemd: /usr/bin/mysql-systemd: line 39: [: /var/lib: binary operator expected
Oct 30 23:31:25 n5 mysql-systemd: /usr/bin/mysql-systemd: line 45: [: /var/log/mysqld.log: binary operator expected
Oct 30 23:31:26 n5 mysqld_safe: 141030 23:31:26 mysqld_safe Logging to '/var/log/mysqld.log'.
Oct 30 23:31:26 n5 mysqld_safe: 141030 23:31:26 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Oct 30 23:31:26 n5 mysqld_safe: 141030 23:31:26 mysqld_safe Skipping wsrep-recover for 6da46c5b-9acc-11e3-9d28-9f9960e4e0f4:2978271210 pair
Oct 30 23:31:26 n5 mysqld_safe: 141030 23:31:26 mysqld_safe Assigning 6da46c5b-9acc-11e3-9d28-9f9960e4e0f4:2978271210 to wsrep_start_position
Oct 30 23:46:29 n5 mysql-systemd: ERROR!
Oct 30 23:46:29 n5 systemd: mysql.service: control process exited, code=exited status=1
Oct 30 23:46:29 n5 mysql-systemd: ERROR! mysql pid file /var/lib/mysql /var/lib/mysql/mysqld.pid empty or not readable
Oct 30 23:46:29 n5 mysql-systemd: WARNING: mysql may be already dead
Oct 30 23:46:29 n5 systemd: mysql.service: control process exited, code=exited status=2
Oct 30 23:46:47 n5 mysqld_safe: 141030 23:46:47 mysqld_safe mysqld from pid file /var/lib/mysql/mysqld.pid ended
Oct 30 23:46:47 n5 mysql-systemd: SUCCESS!
Oct 30 23:46:47 n5 systemd: Unit mysql.service entered failed state.
更新 2 服务器内存信息 - 服务器有 256GB RAM 和 4GB 交换空间
top - 01:15:27 up 14:24, 2 users, load average: 0.00, 0.01, 0.05
Tasks: 314 total, 1 running, 313 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.1 sy, 0.0 ni, 99.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 26394486+total, 24065484 used, 23987937+free, 688 buffers
KiB Swap: 4194300 total, 0 used, 4194300 free. 21135896 cached Mem
我的cnf
[MYSQLD]
user=mysql
datadir=/var/lib/mysql
log_error=/var/log/mysqld.log
log_warnings=2
#log_output=FILE
bind_address=192.168.1.15
### INNODB OPTIONS
innodb_buffer_pool_size=180G
innodb_flush_log_at_trx_commit=2
innodb_file_per_table=1
innodb_data_file_path = ibdata1:100M:autoextend
## You may want to tune the below depending on number of cores and disk sub
innodb_read_io_threads=4
innodb_write_io_threads=4
innodb_io_capacity=400
innodb_doublewrite=1
innodb_log_file_size=1024M
innodb_log_buffer_size=96M
innodb_buffer_pool_instances=8
innodb_log_files_in_group=2
innodb_thread_concurrency=0
#innodb_file_format=barracuda
innodb_flush_method = O_DIRECT
innodb_autoinc_lock_mode=2
## avoid statistics update when doing e.g show tables
innodb_stats_on_metadata=0
default_storage_engine=innodb
innodb_buffer_pool_load_at_startup=1
innodb_buffer_pool_dump_at_shutdown=1
#Time
wait_timeout = 300
connect_timeout=60
interactive_timeout=300
# CHARACTER SET
collation_server = utf8_unicode_ci
init_connect='SET NAMES utf8'
character_set_server = utf8
# REPLICATION SPECIFIC
binlog_format=ROW
# OTHER THINGS, BUFFERS ETC
key_buffer_size = 24M
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 512M
#sort_buffer_size = 256K
#read_buffer_size = 256K
#read_rnd_buffer_size = 512K
#myisam_sort_buffer_size = 8M
skip_name_resolve
max_connect_errors = 100000000
sql_mode = ''
sysdate_is_now=1
max_connections=200
thread_cache_size=512
query_cache_type = 0
query_cache_size = 0
table_open_cache=1024
lower_case_table_names=0
# 5.6 backwards compatibility
explicit_defaults_for_timestamp=1
##
## WSREP options
##
# Full path to wsrep provider library or 'none'
wsrep_provider=/usr/lib64/libgalera_smm.so
wsrep_node_address=192.168.1.15
# Provider specific configuration options
wsrep_provider_options="gcache.size=32768M;gcs.fc_limit = 256; gcs.fc_factor = 0.99"
# Logical cluster name. Should be the same for all nodes.
wsrep_cluster_name="mh1"
# Group communication system handle
wsrep_cluster_address="gcomm://192.168.1.11,192.168.1.13,192.168.1.15"
# Human_readable node name (non-unique). Hostname by default.
#wsrep_node_name=
# Address for incoming client connections. Autodetect by default.
#wsrep_node_incoming_address=
# How many threads will process writesets from other nodes
wsrep_slave_threads=48
# DBUG options for wsrep provider
#wsrep_dbug_option
# Generate fake primary keys for non-PK tables (required for multi-master
# and parallel applying operation)
wsrep_certify_nonPK=1
# Location of the directory with data files. Needed for non-mysqldump
# state snapshot transfers. Defaults to mysql_real_data_home.
#wsrep_data_home_dir=
# Maximum number of rows in write set
wsrep_max_ws_rows=131072
# Maximum size of write set
wsrep_max_ws_size=1073741824
# to enable debug level logging, set this to 1
wsrep_debug=1
# convert locking sessions into transactions
wsrep_convert_LOCK_to_trx=0
# how many times to retry deadlocked autocommits
wsrep_retry_autocommit=1
# change auto_increment_increment and auto_increment_offset automatically
wsrep_auto_increment_control=1
# replicate myisam
wsrep_replicate_myisam=1
# retry autoinc insert, which failed for duplicate key error
wsrep_drupal_282555_workaround=0
# enable "strictly synchronous" semantics for read operations
wsrep_causal_reads=0
# Command to call when node status or cluster membership changes.
# Will be passed all or some of the following options:
# --status - new status of this node
# --uuid - UUID of the cluster
# --primary - whether the component is primary or not ("yes"/"no")
# --members - comma-separated list of members
# --index - index of this node in the list
#wsrep_notify_cmd=
##
## WSREP State Transfer options
##
# State Snapshot Transfer method
wsrep_sst_method=rsync
# Address on THIS node to receive SST at. DON'T SET IT TO DONOR ADDRESS!!!
# (SST method dependent. Defaults to the first IP of the first interface)
#wsrep_sst_receive_address=
# SST authentication string. This will be used to send SST to joining nodes.
# Depends on SST method. For mysqldump method it is root:<root password>
wsrep_sst_auth="xxxx:xxxx"
# Desired SST donor name.
#wsrep_sst_donor=
# Protocol version to use
# wsrep_protocol_version=
[MYSQL]
socket=/var/lib/mysql/mysql.sock
default_character_set=utf8
[client]
socket=/var/lib/mysql/mysql.sock
default_character_set=utf8
[mysqldump]
max_allowed_packet = 512M
socket=/var/lib/mysql/mysql.sock
default_character_set=utf8
[MYSQLD_SAFE]
pid_file=mysqld.pid
log_error=/var/log/mysqld.log
datadir=/var/lib/mysql
答案1
如果你改变这部分my.cnf
[MYSQLD_SAFE]
pid_file=mysqld.pid
成为
[MYSQLD_SAFE]
pid_file=/var/lib/mysql/mysqld.pid
我猜测 systemd 确实杀死了 MySQL，因为它在该位置找不到包含进程号的正确 pid 文件。
答案2
在您的 my.cnf 文件中，更改以下行
[MYSQLD_SAFE]
pid_file=mysqld.pid
到你的实际路径
在我的
pid_file=/var/lib/mysql/mysqld.pid
如果它对你有用请评论