1. Basic overview of jumpserver
1. What is a springboard machine
The springboard machine is a server with public network and intranet. When our developers or operation and maintenance personnel want to maintain the internal cluster service, they need to log in to the server of the springboard machine uniformly, and then log in to the targe ...
Posted by rxbanditboy1112 on Sat, 07 May 2022 12:24:46 +0300
1. Introduction to Prometheus alert
Prometheus Alert is an open source message forwarding system of operation and maintenance alarm center, which supports the early warning messages sent by the mainstream monitoring system Prometheus, log system grayog and data visualization system Grafana. Notification channels support nailing, wechat, Hu ...
Posted by Placebo on Sat, 07 May 2022 10:57:37 +0300
Both write() and send() can send and receive data. What's the difference?send can use flags to specify optional information, where 0 indicates the default sending behaviorsend when the flags are 0, it will wait for the data in the transmission buffer to be cleared before putting the data into the transmission buffer and then returningwrite cann ...
Posted by php_blob on Sat, 07 May 2022 05:21:29 +0300
Socket intermediate application on Linux platform - TCP file transfer
1, Purpose and task of the experiment
Review the IP configuration knowledge of ubuntu.
This experiment requires to master the TCP communication process.
Understand the basic method of TCP programming, the phenomenon of packet splicing and the realization of file transmissi ...
Posted by mightyworld.com on Sat, 07 May 2022 03:29:58 +0300
Squid proxy server
Structure: Working mechanism Agent overview Experimental description
####Centos03 delete the source from the web system
[root@centos03 ~]# rm -rf /etc/yum.repos.d/CentOS-*
[root@centos03 ~]# mount /dev/cdrom /mnt/
[root@centos03 ~]# yum -y install httpd
[root@centos03 ~]# sys ...
Posted by XZer0cool on Sat, 07 May 2022 00:58:13 +0300
Docker's distributed warehouse Harbor
Harbor is an enterprise level Registry server for storing and distributing Docker images. It is open source by VMware. It extends the open source Docker Distribution by adding some necessary functional features for enterprises, such as security, identification and management. As an enterprise private Regis ...
Posted by skippy111 on Fri, 06 May 2022 15:38:20 +0300
A dynamic firewall management tool that supports the network connection and interface security level defined by the network area Supports IPv4, IPv6 firewall settings and Ethernet bridges Support services or applications to directly add firewall rule interfaces There are two configuration modes
Run tim ...
Posted by d-woo on Fri, 06 May 2022 13:01:06 +0300
Rsync was recorded in detail in my previous backup server blog, and it will not be re recorded here.
Lack of Rsync
Compared with the traditional cp and tar backup methods, rsync has the advantages of high security, fast backup and supporting incremental backup. rsync can solve the data backup requirements with low real-time requirement ...
Posted by Scotty2024 on Fri, 06 May 2022 04:39:25 +0300
First of all, when we can use the external network, we only need to change the local image source to Alibaba Cloud or Netease Cloud, and the image of Douban Cloud is fine.
** If we cannot connect to the public network in the intranet, we need to configure the local mirror cloud **
Configure local mirror source
Use df -h to check whether the ...
Posted by ace21 on Fri, 06 May 2022 03:50:48 +0300
Overview of MHA cluster
Introduction to MHA
MHA(Master high Availability)
It is developed by DeNA company in Japan. It is an excellent solution to realize high availability of MySQL. The automatic failover operation of the database can be completed within 0 ~ 30 seconds. MHA can ensure the consistency of data to the ...
Posted by eva21 on Thu, 05 May 2022 22:26:27 +0300