CentOS 7.0 uses firewall as the firewall by default, and the previous version used iptables.
Therefore, you cannot view the firewall status by executing the following command in CentOS 7.
[root@localhost ~]# service iptables status
Redirecting to /bin/systemctl status iptables.service
Unit iptables.service could not be found. ...
Posted on Sat, 04 Apr 2020 09:40:53 -0700 by uNF
Firewall policy - port access
If you cannot connect to Mysql remotely, check whether the default 3306 port allows access:
[root@localhost /]# iptables -L -n|grep 3306
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3306
allow access to
If not, you ne ...
Posted on Fri, 03 Apr 2020 03:22:47 -0700 by jennyp
k8s designed the network model, but gave the implementation to the network plug-in, and the main function of the CNI network plug-in is POD cross-host resource access to each other.
There are two main operations for hdss7-21 and hdss7-22:
wget https://github.com/coreos/flannel/releases/download/v0.11.0/flannel-v0.11.0-lin ...
Posted on Fri, 27 Mar 2020 10:58:28 -0700 by mikeweb
1, Working mechanism of web agentTwo serversIn the traditional mode, the client knows that it is an agentIn transparent mode, the client does not need to be set2, Basic types of agents
Traditional agent: suitable for internet, need to specify the server clearly
Transparent proxy: clients do not need to specify the address and port of the prox ...
Posted on Wed, 25 Mar 2020 20:37:24 -0700 by TGLMan
1. Create a deployment of nginx, and view the ip information allocated by the pod. ping is used on the node node where the pod is located, but not on the master node
Analysis: the first thing I think about is that flanneld is not running normally on two nodes
1. View the network card information of flanneld
[root@k8s2-1 ~]# ifconfig
docker0: f ...
Posted on Sat, 14 Mar 2020 08:45:29 -0700 by timbo6585
The experimental environment is redhat 7.0 systemAs shown in the figure aboveClient uses outlook to send and receive mailThe server sends outgoing mail using postfix, receives mail using dovecot, and forwards the changed user
1. Install dns domain name resolution service
1.1 Configure the server host name, which is consistent with the sending ...
Posted on Sat, 15 Feb 2020 08:27:43 -0800 by murpe
Today, a friend suddenly remembered to see if the server had been blasted by malicious ssh, but he didn't know if it did. There are still a lot of friends like us after checking on github.. A great God has written the plug-in, just use it directly.
Originally, I was going to turn off password acces ...
Posted on Sat, 15 Feb 2020 00:19:18 -0800 by katlis
1: Environmental preparation
2: Cluster deployment process
2.1: set system initialization
2.1.1: three nodes initialize the system, showing only the operation of the master node
2.2:kubeadm deployment and installation
2.2.1: docker installation, both master and slave
Posted on Fri, 14 Feb 2020 05:10:35 -0800 by stewart
Introduction to SNMP
SNMP refers to the Simple Network Management Protocol.It belongs to the application layer protocol of the TCP/IP five-layer protocol.It provides a simple and convenient mode to manage elements in a network.The elements here are the managed objects, either a hardware in ...
Posted on Thu, 13 Feb 2020 19:32:20 -0800 by DJH
Kubernetes (k8s) is an open source platform for automating container operations, based on which you can perform container deployment, resource scheduling, cluster expansion, and so on.If you've used the Docker deployment container before, you can think of the Docker as a component used at the bottom of Kubernetes, which is an upper-level encap ...
Posted on Mon, 20 Jan 2020 11:00:12 -0800 by jowatkins