我们对service和chkconfig两个命令都不陌生，systemctl 是管制服务的主要工具， 它整合了chkconfig 与 service功能于一体。

systemctl is-enabled iptables.service

systemctl is-enabled servicename.service #查询服务是否开机启动

systemctl enable *.service #开机运行服务

systemctl disable *.service #取消开机运行

systemctl start *.service #启动服务

systemctl stop *.service #停止服务

systemctl restart *.service #重启服务

systemctl reload *.service #重新加载服务配置文件

systemctl status *.service #查询服务运行状态

systemctl --failed #显示启动失败的服务

注：*代表某个服务的名字，如http的服务名为httpd

例如在CentOS 7 上安装http

 

[root@CentOS7 ~]# yum -y install httpd

启动服务（等同于service httpd start）

systemctl start httpd.service

停止服务（等同于service httpd stop）

systemctl stop httpd.service

重启服务（等同于service httpd restart）

systemctl restart httpd.service

查看服务是否运行（等同于service httpd status）

systemctl status httpd.service

开机自启动服务（等同于chkconfig httpd on）

systemctl enable httpd.service

开机时禁用服务（等同于chkconfig httpd on）

systemctl disable httpd.service

查看服务是否开机启动 （等同于chkconfig --list）

http://www.linuxidc.com/Linux/2014-11/109236.htm

[root@iZuf67u6816pmg3fc1bx5fZ ~]# rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpmRetrieving http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpmPreparing...                          ################################# [100%]Updating / installing...   1:mysql-community-release-el7-5    ################################# [100%][root@iZuf67u6816pmg3fc1bx5fZ ~]# yum repolist enabled | grep "mysql.*-community.*"mysql-connectors-community/x86_64 MySQL Connectors Community                  42mysql-tools-community/x86_64      MySQL Tools Community                       51mysql56-community/x86_64          MySQL 5.6 Community Server                 344[root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# yum -y install mysql-community-serverLoaded plugins: fastestmirrorLoading mirror speeds from cached hostfileResolving Dependencies--> Running transaction check---> Package mysql-community-server.x86_64 0:5.6.37-2.el7 will be installed--> Processing Dependency: mysql-community-common(x86-64) = 5.6.37-2.el7 for package: mysql-community-server-5.6.37-2.el7.x86_64--> Processing Dependency: mysql-community-client(x86-64) >= 5.6.10 for package: mysql-community-server-5.6.37-2.el7.x86_64--> Processing Dependency: perl(Data::Dumper) for package: mysql-community-server-5.6.37-2.el7.x86_64--> Processing Dependency: perl(DBI) for package: mysql-community-server-5.6.37-2.el7.x86_64--> Running transaction check---> Package mariadb.x86_64 1:5.5.52-1.el7 will be obsoleted---> Package mysql-community-client.x86_64 0:5.6.37-2.el7 will be obsoleting--> Processing Dependency: mysql-community-libs(x86-64) >= 5.6.10 for package: mysql-community-client-5.6.37-2.el7.x86_64---> Package mysql-community-common.x86_64 0:5.6.37-2.el7 will be installed---> Package perl-DBI.x86_64 0:1.627-4.el7 will be installed--> Processing Dependency: perl(RPC::PlServer) >= 0.2001 for package: perl-DBI-1.627-4.el7.x86_64--> Processing Dependency: perl(RPC::PlClient) >= 0.2000 for package: perl-DBI-1.627-4.el7.x86_64---> Package perl-Data-Dumper.x86_64 0:2.145-3.el7 will be installed--> Running transaction check---> Package mariadb-libs.x86_64 1:5.5.52-1.el7 will be obsoleted---> Package mysql-community-libs.x86_64 0:5.6.37-2.el7 will be obsoleting---> Package perl-PlRPC.noarch 0:0.2020-14.el7 will be installed--> Processing Dependency: perl(Net::Daemon) >= 0.13 for package: perl-PlRPC-0.2020-14.el7.noarch--> Processing Dependency: perl(Net::Daemon::Test) for package: perl-PlRPC-0.2020-14.el7.noarch--> Processing Dependency: perl(Net::Daemon::Log) for package: perl-PlRPC-0.2020-14.el7.noarch--> Processing Dependency: perl(Compress::Zlib) for package: perl-PlRPC-0.2020-14.el7.noarch--> Running transaction check---> Package perl-IO-Compress.noarch 0:2.061-2.el7 will be installed--> Processing Dependency: perl(Compress::Raw::Zlib) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch--> Processing Dependency: perl(Compress::Raw::Bzip2) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch---> Package perl-Net-Daemon.noarch 0:0.48-5.el7 will be installed--> Running transaction check---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7 will be installed---> Package perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 will be installed--> Finished Dependency ResolutionDependencies Resolved=============================================================================================================================================== Package                                   Arch                     Version                          Repository                           Size===============================================================================================================================================Installing: mysql-community-client                    x86_64                   5.6.37-2.el7                     mysql56-community                    19 M     replacing  mariadb.x86_64 1:5.5.52-1.el7 mysql-community-libs                      x86_64                   5.6.37-2.el7                     mysql56-community                   2.0 M     replacing  mariadb-libs.x86_64 1:5.5.52-1.el7 mysql-community-server                    x86_64                   5.6.37-2.el7                     mysql56-community                    59 MInstalling for dependencies: mysql-community-common                    x86_64                   5.6.37-2.el7                     mysql56-community                   257 k perl-Compress-Raw-Bzip2                   x86_64                   2.061-3.el7                      base                                 32 k perl-Compress-Raw-Zlib                    x86_64                   1:2.061-4.el7                    base                                 57 k perl-DBI                                  x86_64                   1.627-4.el7                      base                                802 k perl-Data-Dumper                          x86_64                   2.145-3.el7                      base                                 47 k perl-IO-Compress                          noarch                   2.061-2.el7                      base                                260 k perl-Net-Daemon                           noarch                   0.48-5.el7                       base                                 51 k perl-PlRPC                                noarch                   0.2020-14.el7                    base                                 36 kTransaction Summary===============================================================================================================================================Install  3 Packages (+8 Dependent packages)Total download size: 82 MDownloading packages:warning: /var/cache/yum/x86_64/7/mysql56-community/packages/mysql-community-common-5.6.37-2.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEYPublic key for mysql-community-common-5.6.37-2.el7.x86_64.rpm is not installed(1/11): mysql-community-common-5.6.37-2.el7.x86_64.rpm                                                                  | 257 kB  00:00:00     (2/11): mysql-community-libs-5.6.37-2.el7.x86_64.rpm                                                                    | 2.0 MB  00:00:01     (3/11): perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64.rpm                                                                  |  32 kB  00:00:00     (4/11): perl-Compress-Raw-Zlib-2.061-4.el7.x86_64.rpm                                                                   |  57 kB  00:00:00     (5/11): perl-Data-Dumper-2.145-3.el7.x86_64.rpm                                                                         |  47 kB  00:00:00     (6/11): perl-IO-Compress-2.061-2.el7.noarch.rpm                                                                         | 260 kB  00:00:00     (7/11): perl-Net-Daemon-0.48-5.el7.noarch.rpm                                                                           |  51 kB  00:00:00     (8/11): perl-PlRPC-0.2020-14.el7.noarch.rpm                                                                             |  36 kB  00:00:00     (9/11): perl-DBI-1.627-4.el7.x86_64.rpm                                                                                 | 802 kB  00:00:00     (10/11): mysql-community-client-5.6.37-2.el7.x86_64.rpm                                                                 |  19 MB  00:00:07     (11/11): mysql-community-server-5.6.37-2.el7.x86_64.rpm                                                                 |  59 MB  00:00:16     -----------------------------------------------------------------------------------------------------------------------------------------------Total                                                                                                          4.2 MB/s |  82 MB  00:00:19     Retrieving key from file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysqlImporting GPG key 0x5072E1F5: Userid     : "MySQL Release Engineering 
     
      " Fingerprint: a4a9 4068 76fc bd3c 4567 70c8 8c71 8d3b 5072 e1f5 Package    : mysql-community-release-el7-5.noarch (installed) From       : file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysqlRunning transaction checkRunning transaction testTransaction test succeededRunning transactionWarning: RPMDB altered outside of yum.  Installing : mysql-community-common-5.6.37-2.el7.x86_64                                                                                 1/13   Installing : perl-Data-Dumper-2.145-3.el7.x86_64                                                                                        2/13   Installing : mysql-community-libs-5.6.37-2.el7.x86_64                                                                                   3/13   Installing : mysql-community-client-5.6.37-2.el7.x86_64                                                                                 4/13   Installing : perl-Net-Daemon-0.48-5.el7.noarch                                                                                          5/13   Installing : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64                                                                                6/13   Installing : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64                                                                                 7/13   Installing : perl-IO-Compress-2.061-2.el7.noarch                                                                                        8/13   Installing : perl-PlRPC-0.2020-14.el7.noarch                                                                                            9/13   Installing : perl-DBI-1.627-4.el7.x86_64                                                                                               10/13   Installing : mysql-community-server-5.6.37-2.el7.x86_64                                                                                11/13   Erasing    : 1:mariadb-5.5.52-1.el7.x86_64                                                                                             12/13   Erasing    : 1:mariadb-libs-5.5.52-1.el7.x86_64                                                                                        13/13   Verifying  : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64                                                                                 1/13   Verifying  : perl-Data-Dumper-2.145-3.el7.x86_64                                                                                        2/13   Verifying  : perl-IO-Compress-2.061-2.el7.noarch                                                                                        3/13   Verifying  : mysql-community-libs-5.6.37-2.el7.x86_64                                                                                   4/13   Verifying  : mysql-community-common-5.6.37-2.el7.x86_64                                                                                 5/13   Verifying  : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64                                                                                6/13   Verifying  : mysql-community-server-5.6.37-2.el7.x86_64                                                                                 7/13   Verifying  : perl-Net-Daemon-0.48-5.el7.noarch                                                                                          8/13   Verifying  : perl-DBI-1.627-4.el7.x86_64                                                                                                9/13   Verifying  : mysql-community-client-5.6.37-2.el7.x86_64                                                                                10/13   Verifying  : perl-PlRPC-0.2020-14.el7.noarch                                                                                           11/13   Verifying  : 1:mariadb-5.5.52-1.el7.x86_64                                                                                             12/13   Verifying  : 1:mariadb-libs-5.5.52-1.el7.x86_64                                                                                        13/13 Installed:  mysql-community-client.x86_64 0:5.6.37-2.el7    mysql-community-libs.x86_64 0:5.6.37-2.el7    mysql-community-server.x86_64 0:5.6.37-2.el7   Dependency Installed:  mysql-community-common.x86_64 0:5.6.37-2.el7   perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7   perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7    perl-DBI.x86_64 0:1.627-4.el7                  perl-Data-Dumper.x86_64 0:2.145-3.el7          perl-IO-Compress.noarch 0:2.061-2.el7          perl-Net-Daemon.noarch 0:0.48-5.el7            perl-PlRPC.noarch 0:0.2020-14.el7             Replaced:  mariadb.x86_64 1:5.5.52-1.el7                                       mariadb-libs.x86_64 1:5.5.52-1.el7                                      Complete![root@iZuf67u6816pmg3fc1bx5fZ ~]# systemctl enable mysqld[root@iZuf67u6816pmg3fc1bx5fZ ~]# systemctl start mysqld[root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# mysql_secure_installationNOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!In order to log into MySQL to secure it, we'll need the currentpassword for the root user.  If you've just installed MySQL, andyou haven't set the root password yet, the password will be blank,so you should just press enter here.Enter current password for root (enter for none): ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)Enter current password for root (enter for none): OK, successfully used password, moving on...Setting the root password ensures that nobody can log into the MySQLroot user without the proper authorisation.Set root password? [Y/n] YNew password: Re-enter new password: Password updated successfully!Reloading privilege tables.. ... Success!By default, a MySQL installation has an anonymous user, allowing anyoneto log into MySQL without having to have a user account created forthem.  This is intended only for testing, and to make the installationgo a bit smoother.  You should remove them before moving into aproduction environment.Remove anonymous users? [Y/n] Y ... Success!Normally, root should only be allowed to connect from 'localhost'.  Thisensures that someone cannot guess at the root password from the network.Disallow root login remotely? [Y/n] Y ... Success!By default, MySQL comes with a database named 'test' that anyone canaccess.  This is also intended only for testing, and should be removedbefore moving into a production environment.Remove test database and access to it? [Y/n] Y - Dropping test database...ERROR 1008 (HY000) at line 1: Can't drop database 'test'; database doesn't exist ... Failed!  Not critical, keep moving... - Removing privileges on test database... ... Success!Reloading the privilege tables will ensure that all changes made so farwill take effect immediately.Reload privilege tables now? [Y/n] Y ... Success!All done!  If you've completed all of the above steps, your MySQLinstallation should now be secure.Thanks for using MySQL!Cleaning up...[root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# [root@iZuf67u6816pmg3fc1bx5fZ ~]# mysql -uroot -pEnter password: Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 14Server version: 5.6.37 MySQL Community Server (GPL)Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema |+--------------------+3 rows in set (0.00 sec)mysql>
     

 

http://www.cnblogs.com/XBlack/p/5178758.html