Find and delete files
find . -name '*.jpg' | xargs rm -f
Install cron scheduled tasks
yum install -y vixie-cron
.tar.gz
Unzip: tar zxvf FileName.tar.gz
压缩：tar zcvf FileName.tar.gz DirName
-------------------------------------------
cp -Ri file1 file2
copy folder
we
insert after the cursor a
Return to the control command esc
eject:q force quit:q!
save and exit: wq
to the last line: $
find string /
reboot
reboot
service restart
service httpd restart
SElinux setup vsftp
setsebool -P allow_ftpd_full_access on
setsebool -P ftp_home_dir on
getsebool -a|grep ftp
cpu and memory usage
top
Add centos to user group apache
usermod -a -G apache centos
Set all groups of the website root directory /var/www to apache
chown -R :apache /var/www
Set the permissions of the root directory of the website to have read and write permissions for the user group
chmod -R g+rw /var/www
View Apache running users and groups
ps -ef |grep httpd
See which group a user belongs to
id user
View all users
cat /etc/passwd
mysql backup
mysqldump -hhostname -uusername -ppassword databasename > backupfile.sql
mysql restore
mysql -hhostname -uusername -ppassword databasename < backupfile.sql
or
mysql -u root -p
mysql>use database
Then use the source command, followed by a script file (such as the .sql used here)
mysql>source d:\wcnc_db.sql
The system regularly backs up the mysql database every day
1. Create the path/mysqldata to save the backup file
#mkdir /mysqldata
2. Create the /usr/sbin/baktest file
Enter the following:
mysqldump -uroot -proot test | gzip > /mysqldata/test`date +%Y-%m-%d_%H%M%S`.sql.gz
3. Modify the file properties to make it executable
#chmod +x /usr/sbin/baktest
4. Modify /etc/crontab
add below
01 3 * * * root /usr/sbin/baktest
Indicates that the backup is performed at 3:01 every day
5. Restart crond
#/etc/rc.d/init.d/crond restart
Add a user with root privileges
Modify the /etc/passwd file, find the following line, and change the user ID to 0:
mysql backup user permission settings LOCK TABLES, SELECT, FILE, RELOAD, SUPER, SHOW VIEW*
df -hl View partition size
Install and configure apache+php+mysql on Linux (CentOS)
1. First, use the yum remove command to delete all the previously installed ones. The command is: yum remove httpd, and other uninstalls are similar.
2. After uninstalling, execute the following command to install httpd and its related extended support: yum install ntp httpd mysql-server php php-mysql php-mbstring rpm-build gcc mysql-devel openssl-devel cyrus-sasl-devel pkgconfig zlib -devel phpMyAdmin pcre-devel openldap-devel postgresql-devel expect libtool-ltdl-devel openldap-servers libtool gdbm-devel pam-devel gamin-devel postfix
3. Then execute the command to install php and related extension support: yum install php php-devel php-gd php-imap php-ldap php-mysql php-odbc php-pear php-xml php-xmlrpc php-eaccelerator php-magickwand php-magpierss php-mapserver php-mbstring php-mcrypt php-mhash php-mssql php-shout php-snmp php-soap php-tidy curl curl-devel perl-libwww-perl ImageMagick libxml2 libxml2-devel phpmyadmin
After executing the above two commands, many of the services we want are installed, just start httpd and the database system and it will be ok.
Modify ftp access ip
/etc/hosts.allow
block ip address
iptables -I INPUT -s *.*.*.* -j DROP
service iptables save;
service iptables restart;
Pagination display
ls | less
Add sftp account
useradd -s /bin/false -G www user
passwd user
vi /etc/ssh/sshd_config
Subsystem sftp internal-sftp -u 0000
Match User user
ChrootDirectory /home/wwwroot
ForceCommand internal-sftp
AllowTcpForwarding no
service sshd restart
Couldn't read packet: Connection reset by peer
The reason for this problem is the permissions of ChrootDirectory. The directory you set must be owned by the root user, otherwise there will be problems. So please make sure that the owner of the sftp user root directory is root, and the permission is 750 or 755