ntpdate rhel 7

Tags: PostgreSQL installation configuration basic useInstall PostgreSQL 9.6 For example:?InstallationInstall the repository RPMYum Install https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-7-x86_64/pgdg-redhat96-9.6-3.noarch.rpmInstall the client PackagesYum Install postgresql96Install the server packagesYum Install Postgresql96-serverInitialize the database and enable automatic start/usr/pgsql-

return to the instance list after launchAssigns an elastic IP and associates it to an instance. After the instance is started, there will be a public IP, which is dynamically allocated, and the public IP may change after each instance restart, and the elastic IP will not change.After creating the elastic IP, associate it to the instance (if it is not associated, it will be charged)Click the input box to select the instance you just created and confirm the associationReturn an instance to see th

access, then execute the following command: [Root@localhost zones]# firewall-cmd--zone=public--permanent--add-port=80/tcpSuccess[Root@localhost zones]# Firewall-cmd--reloadSuccess 2, the use of the time of the order plus--permanent is the meaning of permanent entry, the Firewall service after the restart is still in force. Otherwise, only valid before restarting the service. 3, we execute the command, the results are actually reflected in the specific configuration file, in fact, we can dire

Reset the root account password for CentOS/RHEL 7 Have you ever encountered this situation: cannot you remember the user account password on Linux? If you forget the root user password, the situation is even worse. You cannot perform any changes for the entire system. If you forget the user password, it is easy to use the root account to reset the password. But if you forget the root account password, what

30 things to be done after minimal RHEL/CentOS 7 installation (1) CentOS is an industrial standard Linux release and a derivative version of Red Hat Enterprise Edition Linux. You can use it immediately after installation. However, to make better use of your system, you need to perform operations such as upgrading, installing new software packages, and configuring specific services and applications. This ar

output is enforcing, which means that the SELinux policy is already in effect.If debugging is required, you can temporarily set the SELinux mode to allow. No restart is required.# Setenforce 0After debugging, set the SELinux to mandatory mode again, without restarting.# setenforce 1LCTT: In a production environment, SELinux will certainly improve security, but it does bring a lot of trouble to application deployment and operation. Specific deployment needs to be based on the situation. ）24. Ins

First, the installation sequence Shun1. Install the Windows operating system first2. Re-install the RHEL 7 systemIi. in grub, add Windows boot informationBecause after installing RHEL7, only the boot information of Linux, but not the information of Windows system, need to be added manually.1. Modify the Grub custom profile (in this case Windows Server 2008 is installed on drive C, and Windows automatically

First, the installation sequence Shun1. Install the Windows operating system first2. Re-install the RHEL 7 systemIi. in grub, add Windows boot informationBecause after installing RHEL7, only the boot information of Linux, but not the information of Windows system, need to be added manually.1. Modify the Grub custom profile (in this case Windows Server 2008 is installed on drive C, and Windows automatically

.... Donechanging ownership and permissions .... DoneRunning postinstall scripts .... Doneattempting to start Webmin Mini Web server: Starting Webmin Serverinch/usr/local/program/webmin-1.750Pre-loaded Webmincore. Done***********************************************************************Webmin has been installed and started successfully. Use your webbrowser to go to http://localhost.localdomain:10000/ andLoginWith the name and password you entered previously.[Email protected] webmin-1.750]# fi

, network overload, or intentional attacks are detected is the robustness of the software. The so-called "robustness" refers to the control system maintaining some other performance characteristics under a certain (structure, size) parameter disturbance. According to different definitions of performance, it can be classified into stable robustness and performance robustness. The fixed controller designed with the robustness of the closed-loop system as the target is called the robust controller.

Set iptables firewall whitelist in Linux (RHEL 6 and CentOS 7) Go to the Linux Command Line and edit the firewall rule configuration file iptables.Vi/etc/sysconfig/iptables The following is an example of whitelist settings: # Firewall configuration written by system-config-securitylevel# Manual customization of this file is not recommended.* Filter: Input accept [0: 0]: Forward accept [0: 0]: Output accept

Set a firewall whitelist in Linux (RHEL 6 and CentOS 7) Go to the Linux Command Line and edit the firewall rule configuration file iptables.Vi/etc/sysconfig/iptables The following is an example of whitelist settings: # Firewall configuration written by system-config-securitylevel# Manual customization of this file is not recommended.*filter:INPUT ACCEPT [0:0]:FORWARD ACCEPT [0:0]:OUTPUT ACCEPT [0:0]:RH-Fire

Tags: dev get environ reset root password password Oar https string emctlNote that the official is not advocating the use of root. Download and install MySQL The latest RPM address https://dev.mysql.com/downloads/repo/yum/ #wget https://repo.mysql.com// #rpm-IVH mysql57-community-release-el7-. noarch.rpm#yum Install Mysql-server Reset Root Password # Systemctl Stop mysqld # Systemctl set-environment mysqld_opts="--skip-grant-tables"# systemctl Start mysqld # mysql-u root MySQL>UPDATE Mysql.user-

When installing the database, the default is to turn off SELinux, the following commands we need to remember, in the wrong time may be used. Do not have any command to see the document, to professional.1. Version[[emailprotected] ~]# uname -aLinux roidb01 3.10.0-123.el7.x86_64 #1 SMP Mon May 5 11:16:57 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux[[emailprotected] ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.0 (Maipo)[[emailprotected] ~]#2. View commands[[emailprotected] ~]# g

Guide CentOS is an industry-standard Linux distribution and is a derivative version of Red Hat Enterprise Linux. You can use it immediately after installation, but in order to better use your system, you need to do some upgrades, install new packages, configure specific services and applications, and so on. When reading a post, please complete the Rhel/centos minimum installation, which is the preferred enterprise and production enviro

RHEL7 Basic UnderstandingRed Hat Company officially released the Enterprise Linux 7 release on June 11, 2014, which has been enhanced in bare servers, virtual machines, IaaS and PaaS, and more reliable and more robust data center environments to meet a variety of business requirements. RHEL 7 provides enterprises with a cohesive, unified infrastructure architectu

Linux Kernel EMD-start/stop/restart the service in RHEL/CentOS 7 and systemdrel One of the major changes in RHEL/CentOS 7.0 is switchingSystemd. It is used to replace SysV and Upstart in the previous versions of Red Hat Enterprise Edition Linux to manage systems and services. Systemd is compatible with the startup scripts of SysV and Linux Standard groups. System

RHEL7 Basic UnderstandingRed Hat Company officially released the Enterprise Linux 7 release on June 11, 2014, which has been enhanced in bare servers, virtual machines, IaaS and PaaS, and more reliable and more robust data center environments to meet a variety of business requirements. RHEL 7 provides enterprises with a cohesive, unified infrastructure architectu

Linux Kernel EMD -- start/stop/restart the service in RHEL/CentOS 7 One of the major changes in RHEL/CentOS 7.0 is switching to systemd. It is used to replace SysV and Upstart in the previous versions of Red Hat Enterprise Edition Linux to manage systems and services. Systemd is compatible with the startup scripts of SysV and Linux Standard groups. Systemd is a s

One of the major changes in Rhel/centos 7.0 is the switch to systemd. It is used to replace SYSV and upstart in previous versions of Red Hat Enterprise Linux and to manage systems and services. SYSTEMD is compatible with startup scripts for SYSV and Linux standard groups.Systemd is a system and service Manager under a Linux operating system. It is designed to be backwards compatible with SYSV startup scripts and provides a number of features, such as