Building K8S cluster of EMQ X MQTT server from scratch

EMQ X Team provides Helm chart for users to deploy EMQ X on kubernetes cluster with one click MQTT server This is the most recommended method of deploying EMQ X MQTT server on kubernetes or k3s cluster by EMQ X Team. This paper will use the method of handwritten yaml file to deploy a K8S cluster of EMQ X MQTT server from scratch, and analyze t ...

Posted by chacha102 on Mon, 29 Jun 2020 22:46:35 -0700

DNS service of domain name system

)] What is DNS? Domain Name System is the phone book of the whole Internet. It can translate the domain name that can be understood into the IP address that can be understood by the machine, so that Internet users no longer need to directly contact the IP address that is difficult to read and understand. The domain name system is very imp ...

Posted by gskaruz on Mon, 22 Jun 2020 23:16:42 -0700

a21_Python development web crawler - learning notes

Select reference Because I am learning to write at the same time, rather than starting to write in a very organized way after I have learned it completely, so reference materials are very important (originally personal development experience is very important, but I am zero Foundation) Official Py ...

Posted by zero816 on Fri, 19 Jun 2020 03:15:13 -0700

Solve octavia failed to run

octavia failed to run preface If not specifically noted, all command lines are executed using the admin account. Problem description Create a loadbalance by calling octavia's api as follows @token = gAAAAABe6y8up_ZdUS43Lfe8AFERncGtZFK6IHrnd-MSgbE5U-xKg-6N04eUV3tNwlKEAiZVNIl6I0NVvjMT97CygiJL-7XFciQH ...

Posted by byronwells on Fri, 19 Jun 2020 00:58:04 -0700

2 DHCPV6: configuration and trunking

Article catalog 1. Introduction 2. No status 3.dhcpv6 3.1 Cisco 3.2 Huawei 1. Introduction At present, IPv6 address allocation methods are as follows: 1. Manual configuration. Manually configure IPv6 address / prefix and other network configuration parameters (DNS, NIS, SNTP server address, et ...

Posted by gavinr98 on Mon, 15 Jun 2020 21:09:04 -0700

Solution for ping incompatibility between GNS3 router devices

0x00 experimental environment Name Edition Explain Host OS Window 7 simulator GNS3 v2.2.8 GNS3 vm v2.2.8 virtual machine VMware 15 Router Mirror c7200 adventerprisek9 0x01 Network Topology 0x02 problem description Host PC1 ping does not pass through f1 port of router R1 S ...

Posted by eternalprophet on Thu, 11 Jun 2020 18:49:34 -0700

Let's Encrypt configure universal domain name certificate

Recently, more than 10 secondary domain names of individuals need to issue certificates. Let's Encrypt provides free SSL certificates with a term of three months. When they expire, they need renew. The official also provides certbot, a tool for automatic renew. Here, we record the general certificate that uses Let's Encrypt to generate t ...

Posted by iRock on Fri, 29 May 2020 00:36:59 -0700

Experiment of DHCP auto acquiring ip address

1: Experimental environment1.1: Huawei ensp software1.2: PC, router and switchPC in initialization state and router and switch in initialization state2: Experimental process2.1: equipment configurationIn the ensp, the PC, router and switch are made into a topological diagram according to the diagram.2.2 configure SW1 switch [SW1]vlan batch 1 ...

Posted by themaxx113 on Thu, 28 May 2020 07:12:02 -0700

K8S deploy stateful application through Statefulset

1, Understanding statefuse 1. Statefuse ensures that pod s retain their identity (container name) and state after rescheduling.2. Statefuse achieves that each pod corresponds to the corresponding PV volume, and each pod can support a set of independent data volumes.3. Provide a stable network identity. Each pod created by a Statefulset has a z ...

Posted by kh411dz on Thu, 21 May 2020 08:38:01 -0700

Explanation of MySQL skip name resolve

mysql connection is slow. Log in to the server to view mysql logs:IP address 'XX.XX.XX.XX' has been resolved to the host name 'XX.XX.XX.XX.ro.ovo.sc', which resembles IPv4-address itself.The reason is that mysql performs DNS reverse resolution on the connected client.There are two solutions:1. Write the ip address of the client in the / etc/ ...

Posted by lohmk on Wed, 06 May 2020 22:54:02 -0700