Linux

1. Edit Firewall configuration: Vi /etc/sysconfig/iptables Firewall Add New port 7022-a input -m state --state new  -m tcp -p tcp --dport 7022 -j accept=================================

#chkconfig命令: Run-level information primarily used to start/stop and query system servicesDisplays the health status information for all run-level system services:[[email protected]_168_102_centos ~]# chkconfig --listabrt-ccpp    

GPASSWD (1) User commands GPASSWD (1)NameGPASSWD-Administrators/etc/group and/etc/gshadowBigGPASSWD [Options] GroupStrokeThe GPASSWD command is used to Administer/etc/group, And/etc/gshadow. Every group can has administrators, members and a password.

I understand that the Linux system boot sequence is as follows, if there are differences, can be explored together.The order in which Linux systems boot up is: BIOS self-test, check hardware, select boot media such as CD or HDD Oru disk and so

2005years4Month7Day,Linus Torvaldsreleased a new generic tool package called "git "(The Git Source code management system). "Git "(source code control System), General people do not, but, system developers must, especially large system development.

Use the shortcut keys under Linux Ctrl + a switches to the command line start This operation is the same as the home implementation, but the home is not available in certain UNIX environments, it can be used, the VIM under Linux is

Groupadd (8) System administration commands Groupadd (8)NameGroupadd-Create a new groupOutlineGroupadd [Options] GroupDescribeThe Groupadd command creates a new group account using the values specified on the command line plus the default values FR

1:yum Install subversion?2: input rpm-ql subverionrpm-q app---software is installed svn-help---can see how SVN is used? 3: Create SVN repository directory mkdir-p/VAR/SVN /svnrepos?4: Create a repository svnadmin create/var/svn/svnrepos the command

Linux timed TasksThe crontab command option is basic only for user action options:-U Specify user-l List A user task schedule-R Delete a user task-e Edit a user taskView a user's scheduled tasks crontab-u root-lTo view all users can only enumerate

File system:Rootfs: #根文件系统FHS: Linux/boot: #系统启动相关的文件, such as kernel, INITRD, and Grub (bootloader)/dev: #设备文件 block device: Random access, block character device: linear access. by character/etc: #配置文件/home: #用户的家目录, each user's house directory

Configure yum local in Linux 6.2, linux6.2yum Yum 1. Mounting the iso file [Root @ localhostmedia] # mount/dev/cdrom/media 2. Install createrepo Createrepo is the configuration tool for configuring the YUM source. Check whether the createrepo

RHEL6.5 Delete desktop starters (computer/Home/recycle bin) and rhel6.5 starters First install gconf-editor to get the gconftool-2 command Terminal command: Gconftool-2 -- set/apps/nautilus/desktop/computer_icon_visible -- type = bool

Precautions for Centos7 Installation I recently purchased a new server. Most servers and PCs do not have optical drives. I used usb to install the system this time. The server performs raid 1. 1. Prepare a USB flash drive of about 8 GB; 2; 3,

Disable UseDNS to accelerate SSH Login through CentOS Users who often log on to SSH can feel that every time they log on to SSH, they always have to wait for a moment to connect. This is because the OpenSSH server has a DNS search option, UseDNS is

Linux performance diagnostic toolVmstat: virtual memory status-Swpd free buff cache si so in cs Ref: http://www.cnblogs.com/ggjucheng/archive/2012/01/05/2312625.htmlIostat: io statusAvgqu-sz await svctm reference:

Configure static IP for centos7 Centos7 is installed along the way according to the developer type during initial installation. It is already set to bridge Mode in vmware. It is said that the network is automatically connected according to DHCP, but

Centos memory release command An old PHP backend server was checked with free-m today and found that the memory was full. Next, press shift + m, that is, sort by memory usage percentage, and find that the process ranked first occupies 0.9%. What

Modify the number of TCP connections in CentOS I. Modify the limit on the number of files (1) vi/etc/security/limits. conf Join: * Soft nofile 32768 * Hard nofile 32768 Save and exit. Log on to an ssh window (or log on to the local machine again)

Enable FTP service in CentosStep 1: # chkconfig vsftpd on // start the vsftpd service at startupStep 2: #/etc/init. d/vsftpd start // enable the vsftpd serviceStep 3: # vi/etc/vsftpd. conf // edit the vsftp configuration fileFind the following and

Nginx Server Vulnerability repair opensslI. Download and decompress the openssl source codeMkdir-p/srv/. soft/opensslCd/srv/. soft/opensslWget http://www.openssl.org/source/openssl-0.9.8za.tar.gzTar zxf openssl-0.9.8.za.tar.gzCd openssl-0.9.8.zaIi.