What should I do if I cannot use the yum command under centos7?

When loading CentOS-7.0-1406, there are many optional versions. For ordinary users, they don’t know which one to choose. Here is a brief introduction: (1) CentOS-xxxx-LiveCD.ios and CentOS-xxxx- What is the difference between bin-DVD.iso? The former only has 700M, and the latter has 3.8G. The difference is not only in size, but the more essential difference is that CentOS-xxxx-LiveCD.ios can only be loaded into the memory and run, and cannot be installed. Only CentOS-xxx-bin-DVD1.iso can be installed on the hard disk. (2) CentOS-xxx-bin-DVD1.iso, Ce

Open the centos7 page and appear: welcome to emergency mode! afterloggingin, type "journalctl -xb" to viewsystemlogs, "systemctlreboot" toreboot, "systemctldefault" to tryagaintobootintodefaultmode. giverootpasswordformaintenance(??Control-D???): Solution: execute r

Because C++11 needs to be used, but the gcc4.4.7 that comes with CentOS does not support it, I decided to upgrade gcc. The operation is as follows: #Backup mv/etc/yum.repos.d/devtools-2.repo/etc/yum.repos.d/devtools-2.repo.bakwgethttp://people.centos.org/tru/devtools-2 /devtools-2.repo-O/etc/yum.repos.d/devtools-2.repoyuminstalldevtoolset-2-gccdevtoolse

There is a lot of garbage in the tmp directory in the centos7 system. If you want to clear the garbage, how should you do it? Let’s take a look at the detailed tutorial below. To view the list of files in the tmp file directory, execute the command cdtmp/ to switch to the current file directory of tmp, and execute the ll command to view the list of files in the current directory. As shown below. Use the rm command to delete files. It should be noted that the rm command deletes files from the system forever. Therefore, it is recommended that when using the rm command, it is best to give a prompt before deleting the file. Use the command rm-i file name, wait for the user to confirm deletion (y) or skip deletion (n), and the system will perform corresponding operations. As shown below.

1. Download the gitlab installation package. Download the latest Chinese version of the gitlab installation package from [Tsinghua University Open Source Software Mirror Station]. The installation package comes with a simplified Chinese localization package. Download the latest gitlab installation package from [gitlab official website]. 2. Install gitlab, take gitlab-ce-14.9.4-ce.0.el7.x86_64 as an example, upload it to the centos server and use yum to install gitlabyum-yinstallgitlab-ce-14.3.2-ce.0.el7.x86_64. rpm uses yum to install gityum-yinstallgit#Install git and modify the gitlab configuration file vi

Set password rules for security reasons Set the number of days after which passwords expire. User must change password within days. This setting only affects created users, not existing users. If setting to an existing user, run the command "chage -M (days) (user)". PASS_MAX_DAYS60#Password expiration time PASS_MIN_DAYS3#Initial password change time PASS_MIN_LEN8#Minimum password length PASS_WARN_AGE7#Password expiration prompt time Repeat password restriction use [root@linuxprobe~]#vi/etc/pam.d/system-auth#nearline15:

1. The compressed folder is a zip file [root@cgls]#zip-rmydata.zipmydata2. Unzip mydata.zip into the mydatabak directory [root@cgls]#unzipmydata.zip-dmydatabak3.mydata01 folder and mydata02.txt are compressed into mydata.zip[root@cgls]#zipmydata.zipmydata01mydata02.txt4. Decompress the mydata.zip file directly [root@cgls]#unzipmydata.zip5. View myd

Centos7 does not have a mysql database. The default database is mariadb (a branch of mysql). You can install the mysql database manually by following the steps below. 1. Download the rpm installation file wgethttp://repo.mysql.com/mysql-community-release-el7.rpm 2. Execute rpm to install rpm-ivhmysql-community-release-el7.rpm. After the dependency resolution is completed, the following options appear: dependenciesresolved =================================