When linux reads and writes files, buffer cache is used to cache blocks on the physical disk, thus speeding up access to data on the disk. The contents of the buffer cache correspond to a block on disk, which is usually 1K and is contiguous. In lin
About Kubelet the Kubelet component runs on the Node node, maintains the running Pods and provides the kuberntes runtime environment, mainly accomplishing the following missions: 1. Monitor the pods2 assigned to the Node node. mount the vol required for the pod
Zabbix is an enterprise-level open source solution based on WEB interface that provides distributed system monitoring and network monitoring capabilities. Zabbix can monitor various network parameters to ensure the safe operation of the server system, and provides a flexible notification mechanism for system administrators to quickly locate / resolve storage.
1. What is a container? docker must say container, so we need to talk about the concept of container first. In fact, a container is a tool, which generally refers to other tools that can be used to store and transport items; items can be placed in containers, and containers can protect objects. Common
First connect to mongodb, then connect to the database by using mongo's shell: switch to the Mongodb directory # cd / mongodb/bin input port to log in to Mongodb#./mongo-- port=27017# to a
Preface Linux, full name GNU/Linux, is a set of Unix-like operating system that is free to use and spread freely. It is a multi-user, multi-task, multi-thread and multi-CPU operating system based on POSIX and Unix. With the development of the Internet, Linux got
Welcome to scan the code to join Java Gaozhi × × stream 1, leaky bucket principle what is the principle of leaky bucket? We can literally understand that there is a bucket, its volume is fixed, there is a small hole under the bucket will keep leaking out, and at the top of the bucket there is a faucet, also keep pouring water into the bucket. False
(the first law of website performance optimization: give priority to the use of caching to optimize performance) the basic principle of caching: caching refers to storing data in a storage medium with relatively high access speed for processing by the system. The essence of caching: caching is an in-memory Hash table. In a website application, the data cache is based on a pair of key values.
About Nginx Nginx (engine x) is a high-performance HTTP and reverse proxy server, as well as an IMAP/POP3/SMTP server. It distributes the source code as a BSD-like license because of its stability, rich feature set, and examples.
Linux allows ping response by default, that is, ping is enabled, but ping may be the beginning of network insecurity, so turning off ping can improve the security of the server. Whether the system allows ping or not is determined by two factors:
one。 Overview of reverse proxy (case) 1. Reverse proxy (Reverse Proxy) means that a proxy server accepts the connection request on the Internet, then forwards the request to the server on the internal network, and returns the results obtained from the server to the Intern
1, experiment name: layer 2 switch interworking with different VLAN (Huawei) 2, experiment environment: (1) PC1 PC2 (2) two layer 2 switches (3) one layer 3 switch (routing function) 3, experiment topology: 2 configuration steps: (1) configure PC1:IP: 19
About Docker Docker is an open source application container engine that allows developers to package their applications and dependency packages into a portable container and publish them to any popular Linux or Windows machine.
Preface ClamAV and hm is an open source antivirus engine used to detect Trojans, viruses, malware and other malicious threats. First of all, through the startup script, the attack program runs as a daemon in the background after booting, and the child process of the daemon is still the daemon, which makes the process not easy to find.
Use eNSP to build the experimental environment, as shown in figure-3. To implement this case, you need to follow the steps below: 1 [R1] ip route-static 0.0.0.0 0.0.0.0 192.168.2.22 [R3] ip route-s
OSPF Overview OSPF protocol is a link-state protocol. Each router is responsible for discovering and maintaining relationships with neighbors and describing known neighbor lists and link cost LSU (Link State Update) messages through reliable flooding and autonomous system AS (Aut).
The Linux alias command is used to set the alias of the instruction. Users can use alias to customize the alias of the instruction. If you enter only alias, you can list all current alias settings. The validity of alias is only limited to the login operation. If you want to set an alias automatically every time you log in
Editors in background text mode include vi and vim (an enhanced version of vi). Vi and vim are our most commonly used editors in Linux. Vi or vim is the most basic text editing tool for Linux, although v or vim is not as simple as a mouse click in a graphical interface editor.
The purpose is to query the results of formatted output scripts such as process name, cup memory utilization, startup time online status and so on: [root@zabbix ~] # sh / app/shell/app_status.shProcessName--
1. Prometheus introduces Prometheus as the earliest open source monitoring and alarm solution by SoundCloud. And has grown into the second CNCF graduate program after Kubernetes. With the original concept of the cloud
