Can'；不能通过tcp/ip连接到mysql，但可以通过套接字连接

系统：CentOS 7.3.1611

MySQL:5.6.47

它类似于--跳过网络选项。但是在my.cnf中没有跳过网络

使用ps aux | grep mysql可以找到mysql服务

netstat-talnp | grep3306和
lsof-i:3306都不返回任何内容

使用

mysql-uroot-h127.0.0.1-p

将返回

无法连接到'127.0.0.1'（111）

上的mysql服务器，但

mysql-uroot-hlocalhost-p

可以访问

my.cnf

[client]
#password   = your_password
port        = 3306
socket      = /tmp/mysql.sock
bind-address = 0.0.0.0

[mysqld]
port        = 3366
socket      = /tmp/mysql.sock
datadir = /www/server/data
default_storage_engine = InnoDB
performance_schema_max_table_instances = 400
table_definition_cache = 400
skip-external-locking
key_buffer_size = 32M
max_allowed_packet = 100G
table_open_cache = 128
sort_buffer_size = 768K
net_buffer_length = 4K
read_buffer_size = 768K
read_rnd_buffer_size = 256K
myisam_sort_buffer_size = 8M
thread_cache_size = 16
query_cache_size = 16M
tmp_table_size = 32M
sql-mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
local-infile=0
skip_symbolic_links=yes

explicit_defaults_for_timestamp = true
#skip-name-resolve
max_connections = 500
max_connect_errors = 100
open_files_limit = 65535

log-bin=mysql-bin
binlog_format=mixed
server-id = 1
expire_logs_days = 10
slow_query_log=1
slow-query-log-file=/www/server/data/mysql-slow.log
long_query_time=3
#log_queries_not_using_indexes=on


innodb_data_home_dir = /www/server/data
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /www/server/data
innodb_buffer_pool_size = 128M
innodb_log_file_size = 64M
innodb_log_buffer_size = 16M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50
innodb_max_dirty_pages_pct = 90
innodb_read_io_threads = 1
innodb_write_io_threads = 1

[mysqldump]
quick
max_allowed_packet = 500M

[mysql]
no-auto-rehash

[myisamchk]
key_buffer_size = 32M
sort_buffer_size = 768K
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysqld_safe]
log-error=/var/log/mysqld.log

错误页

Failed to obtain JDBC Connection; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

错误日志

2020-02-25 17:30:26 7117 [Note] Plugin 'FEDERATED' is disabled.
2020-02-25 17:30:26 7117 [Note] InnoDB: Using atomics to ref count buffer pool pages
2020-02-25 17:30:26 7117 [Note] InnoDB: The InnoDB memory heap is disabled
2020-02-25 17:30:26 7117 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2020-02-25 17:30:26 7117 [Note] InnoDB: Memory barrier is not used
2020-02-25 17:30:26 7117 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-02-25 17:30:26 7117 [Note] InnoDB: Using Linux native AIO
2020-02-25 17:30:26 7117 [Note] InnoDB: Using CPU crc32 instructions
2020-02-25 17:30:26 7117 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2020-02-25 17:30:26 7117 [Note] InnoDB: Completed initialization of buffer pool
2020-02-25 17:30:26 7117 [Note] InnoDB: Highest supported file format is Barracuda.
2020-02-25 17:30:26 7117 [Note] InnoDB: 128 rollback segment(s) are active.
2020-02-25 17:30:26 7117 [Note] InnoDB: Waiting for purge to start
2020-02-25 17:30:27 7117 [Note] InnoDB: 5.6.47 started; log sequence number 7634069
2020-02-25 17:30:27 7117 [Note] RSA private key file not found: /www/server/data//private_key.pem. Some authentication plugins will not work.
2020-02-25 17:30:27 7117 [Note] RSA public key file not found: /www/server/data//public_key.pem. Some authentication plugins will not work.
2020-02-25 17:30:27 7117 [Note] Server hostname (bind-address): '*'; port: 3366
2020-02-25 17:30:27 7117 [Note] IPv6 is available.
2020-02-25 17:30:27 7117 [Note]   - '::' resolves to '::';
2020-02-25 17:30:27 7117 [Note] Server socket created on IP: '::'.
2020-02-25 17:30:27 7117 [Note] Event Scheduler: Loaded 0 events
2020-02-25 17:30:27 7117 [Note] /www/server/mysql/bin/mysqld: ready for connections.

---

您已将

端口设置为3366，但您正在尝试通过默认端口3306进行连接。使用mysql-H127.0.0.1-P3366…

指定您正在使用的端口

---

您仍在使用默认的unix域套接字路径

/tmp/mysql.sock

，因此通过该方法进行连接时无需额外选项。

是否有理由将innodb_读取_io_线程和innodb_写入_io_线程限制为1？补充资料要求。RAM大小、#内核、MySQL主机服务器上的任何SSD或NVME设备？在pastebin.com上发布并共享链接。从SSH登录根目录中，文本结果为：B）显示全局状态；至少24小时正常运行后C）显示全局变量；D） 显示完整的进程列表；E） 完成服务器工作负载优化分析的MySQLTuner报告以提供建议。

2020-02-25 17:30:26 7117 [Note] Plugin 'FEDERATED' is disabled.
2020-02-25 17:30:26 7117 [Note] InnoDB: Using atomics to ref count buffer pool pages
2020-02-25 17:30:26 7117 [Note] InnoDB: The InnoDB memory heap is disabled
2020-02-25 17:30:26 7117 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2020-02-25 17:30:26 7117 [Note] InnoDB: Memory barrier is not used
2020-02-25 17:30:26 7117 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-02-25 17:30:26 7117 [Note] InnoDB: Using Linux native AIO
2020-02-25 17:30:26 7117 [Note] InnoDB: Using CPU crc32 instructions
2020-02-25 17:30:26 7117 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2020-02-25 17:30:26 7117 [Note] InnoDB: Completed initialization of buffer pool
2020-02-25 17:30:26 7117 [Note] InnoDB: Highest supported file format is Barracuda.
2020-02-25 17:30:26 7117 [Note] InnoDB: 128 rollback segment(s) are active.
2020-02-25 17:30:26 7117 [Note] InnoDB: Waiting for purge to start
2020-02-25 17:30:27 7117 [Note] InnoDB: 5.6.47 started; log sequence number 7634069
2020-02-25 17:30:27 7117 [Note] RSA private key file not found: /www/server/data//private_key.pem. Some authentication plugins will not work.
2020-02-25 17:30:27 7117 [Note] RSA public key file not found: /www/server/data//public_key.pem. Some authentication plugins will not work.
2020-02-25 17:30:27 7117 [Note] Server hostname (bind-address): '*'; port: 3366
2020-02-25 17:30:27 7117 [Note] IPv6 is available.
2020-02-25 17:30:27 7117 [Note]   - '::' resolves to '::';
2020-02-25 17:30:27 7117 [Note] Server socket created on IP: '::'.
2020-02-25 17:30:27 7117 [Note] Event Scheduler: Loaded 0 events
2020-02-25 17:30:27 7117 [Note] /www/server/mysql/bin/mysqld: ready for connections.