linux下mysql8安装
今天折腾了一下午，安装了mysql8.0.17.
官方查看安装步骤https://dev.mysql.com/doc/refman/8.0/en/binary-installation.html。
根据我个人的安装情况，重新写一下安装过程，中间出现的问题，我在文章最后统一记录了下来。
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum update
//yum install mysql-server //由于网络原因下载比较慢，于是自己手动下载了包
//下载mysql-server mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz
//解压
xz -d mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz
tar xvf mysql-8.0.17-linux-glibc2.12-x86_64.tar
mv mysql-8.0.17-linux-glibc2.12-x86_64 mysql
mv mysql /usr/local/
shell> groupadd mysql
shell> useradd -r -g mysql -s /bin/false mysql
shell> cd /usr/local
shell> cd mysql
shell> mkdir mysql-files
shell> chown mysql:mysql mysql-files
shell> chmod 750 mysql-files
shell> bin/mysqld --initialize --user=mysql ##会创建一个root账户，有一个随机密码，记下来，如下图：
shell> bin/mysql_ssl_rsa_setup
shell> bin/mysqld_safe --user=mysql &
# Next command is optional
shell> cp support-files/mysql.server /etc/init.d/mysql.server
chown mysql:mysql -R /var/lib/mysql
#启动服务
support-files/mysql.server start
##连接
mysql -uroot -p
问题：
问题参考：https://blog.csdn.net/m0_37886429/article/details/78844358
缺包libnuma，error while loading shared libraries: libnuma.so.1
yum 安装的libnuma.so.1，但安装时默认安装的是32的，但db2需要的是64位的
1.如果已经安装了libnuma.so.1，先yum remove libnuma.so.1
2.yum -y install numactl.x86_64
修改密码
问题参考：https://blog.csdn.net/Source_00/article/details/79902096
执行initialize后，会为root账户设置一个随机初始密码，记住密码，然后去重置密码，
我使用了上述链接方法中mysql_secure_installation 命令修改root密码
本地连接报错
mysql -uroot -p
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)，
问题参考：https://blog.csdn.net/u013631121/article/details/80875837
需要创建my.cnf并配置socket且 加入skip-grant-tables，我的/etc/my.cnf配置如下：
参考：https://blog.csdn.net/Source_00/article/details/79902096
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock #该路径要与下面的路径一致，否则会报错
[mysqld]
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES # 一般配置选项
basedir = /usr/local/mysql #mysql安装路径
datadir = /usr/local/mysql/data/mysqldata #数据存储路径
port = 3306
socket = /var/run/mysqld/mysqld.sock #该路径要与上面的路径一致，否则会报错
character-set-server=utf8
back_log = 300
max_connections = 3000
max_connect_errors = 50
table_open_cache = 4096
max_allowed_packet = 32M
#binlog_cache_size = 4M
skip-grant-tables
max_heap_table_size = 128M
read_rnd_buffer_size = 16M
sort_buffer_size = 16M
join_buffer_size = 16M
thread_cache_size = 16
query_cache_size = 128M
query_cache_limit = 4M
ft_min_word_len = 8
thread_stack = 512K
transaction_isolation = REPEATABLE-READ
tmp_table_size = 128M
#log-bin=mysql-bin
long_query_time = 6
server_id=1
innodb_buffer_pool_size = 1G
innodb_thread_concurrency = 16
innodb_log_buffer_size = 16M
innodb_log_file_size = 512M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
innodb_file_per_table = on
[mysqldump]
quick
max_allowed_packet = 32M
[mysql]
no-auto-rehash
default-character-set=utf8
safe-updates
[myisamchk]
key_buffer = 16M
sort_buffer_size = 16M
read_buffer = 8M
write_buffer = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit = 8192配置完成连接成功，就可以正常操作了！