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Use iperf The tool tests the bandwidth between H1 and H2 for basic performance evaluation. Experimental environment: CentOS7 minimize installation, Mininet 2.2.2 Ubuntu or CentOS with a graphical desktop is recommended for viewing output Steps: 1. To install the iperf command, please refer to Install Iperf under CentOS 7 We use ...

KVM virtual machine: 1.KVM is the abbreviation of kernel based virtual machine. It is an open source system virtualization module. It has been integrated into various major Linux distributions since Linux 2.6.20. It uses Linux's own scheduler for management, so compared with Xen, its core source code is very few. KVM has become one of the mai ...

Sometimes, when the system is running, there is a sudden crash, but we have to find out the cause. Although we can solve the current problem through the temporary protection mechanism watchdog, but to find the cause of the crash, we have to rely on the special tool Kdump for kernel analysis. Although I don't understand the Linux kernel, I can f ...

I. Experimental Environment 1. System version: Centos 7.6 x86 64 2. Redis version 4.0.9 3. Cluster IP information 172.16.100.201  172.16.100.202  172.16.100.203 4. IP information ready to join the cluster 172.16.100.204  172.16.100.205  172.16.100.206 5, purpose Expand the 3 primary and 3 secondary nodes of Redis cluster to 6 primary and ...

The lsblk command can list information about all available block devices, such as logical disks, while df -h looks at file system level information. Lsblk command is included in util Linux package. Install util Linux package from yum, and util Linux contains multiple command tools. [root@localhost ~]# df -h Filesystem Size Used ...

System version: CentOS 7.4 top 17:49:04 // current time up 3: 55 // System running time, format: minute 2 users // Number of currently logged in users load average // The three values are the system load in 1 minute, 5 minutes and 15 minutes respectively Tasks // Total process running // Number of running proces ...

1. Start docker service [root@docker ~]# systemctl start docker 2. View the image in docker [root@docker ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE centos/mysql-57-centos7 latest 2e4ddfafaa6f 6 months ago 445MB gogs/gogs ...

View kernel uname -r Set kernel source Mainly http://elrepo.org/tiki/tiki-index.php The ELRepo warehouse is a community-based Enterprise Linux warehouse that provides support for Red Hat Enterprise (RHEL) and other RHEL based Linux distributions (CentOS, Scientific, Fedora, etc.). ELRepo focuses on software packages related ...

View IP information After CentOS is installed, view the ip information through the ip addr command [root@localhost yum.repos.d]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft f ...

Overview of clusters RabbitMQ cluster is implemented through Erlang's distributed feature (magic cookie authentication node). Each RabbitMQ service is peer-to-peer node, that is, each node provides services to the client to connect, send and receive messages. These nodes replicate message queue structure through RabbitMQ HA queue (mi ...