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1. PG introduction Following the last shared< Ceph introduction and principle architecture sharing >This time, I will mainly share the detailed explanation of various states of PG in Ceph. PG is one of the most complex and difficult concepts. The complexity of PG is as follows: At the architecture level, PG is located in the middle of t ...

1. Two ways to deploy K8s in production environment kubeadm Kubedm is a tool that provides kubedm init and kubedm join for rapid deployment of Kubernetes clusters. Deployment address: https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/Binary It is recommended to download the binary package of the distribution from the officia ...

Variable naming 1. It can only contain numbers, underscores and letters 2. Can only start with underscore or letter! Variable level Global: set from the command line or configuration file Play: set in play and related structures Host: tasks collected or registered by lists, facts Variable priority setting: Narrow and wide area Variable set ...

GitStats - Git historical statistics tool 2020-07-212020-07-21 10:31:28 read 1.1K0 If you are a member of the R & D effectiveness team or engaged in CI/CD or DevOps, in addition to providing infrastructure, indicators and data are also a very important link. For example, you need to analyze ...

Guava is Google's open source Java class library, which provides a tool class RateLimiter. Let's take a look at the use of RateLimiter to give you a sensory impression of current limiting. Suppose we have a thread pool, which can only process two tasks per second. If the task submitted is too fast, it may lead to system instability. At this tim ...

NFS introduction Network file system is a network file system that shares files with other clients for mounting nfs can only be shared between linux characteristic (1) Provide transparent file access and file transfer (2) It is easy to expand new resources or software without changing the existing working environment (3) High performance ...

Correct handling method after registry downtime Microservice is a major trend at present. The registry is not only the most basic component of microservice, but also the most core component. It provides the client with a list of all callable services. Because of this, the availability of the registry is highly required in the microservice ...

Linux Svn automatic update 1. Installation yum install subersion 2. Configuration 2.1 create warehouse We can store all the warehouses in / www/server/svn/tests. Later, we can put all the warehouses in / www/server/svn [root ~]# cd /www/server/svn [root svn]# svnadmin create /www/server/svn/tests [root svn]# ls chats tests [root svn]# c ...

This experiment requires two hosts nodea and nodeb 1. Explanation of dns terms DNS: domain name service 1) About clients: /etc/resolv.conf    ## dns points to file nameserver 172.25.254.117 2) Test: host www.baidu.com       ## Address resolution command dig www.baidu.com      &nbsp ...

install Install the ftp server with the following command sudo apt install vsftpd   Software management Software management mode service vsftpd start start-up service vsftpd restart restart service vsftpd stop stop it service vsftpd status View status And write the configuration anonymous_enable=YES anon_root= /data/pub loca ...