redis management tool

The cornerstone of Redis memory management ZMALLC.C Source code interpretation (a) The cornerstone of Redis memory management ZMALLC.C Source code interpretation (ii) The previous two posts, detailed introduction of the ZMALLOC.C file of the various functions, but we want to learn more

Demand: In order to accurately monitor the internal state of each server, without affecting the existing business logic, a simple centralized monitoring system for the server needs to be deployed quickly. After consideration, you can use the Redis pub/sub function to implement a monitoring system is very good and appropriate. Of course, we can also pass this to do batch management. Pub/sub is literally t

In the previous article, redmine, a project management tool from the rails world, introduced redmine, A rails-based project management tool that provides version management. Next, we will introduce subversion (SVN) installation and use in redmine. SVN installation is relat

will terminate the replication relationship with the previous master, and will become the new master slave, before the data in master will be emptied, Change to the data in the new master. However, if the slaveof NO one command is executed on the current slave server, the server simply interrupts the replication relationship with the current master and upgrades to the standalone master, where the data is not emptied. slowlogsubcommand [argument] 1). Slowlog GET N: R

Ansible @ an efficient configuration management tool-Ansible configure management-translation (8), ansible-ansibleIf you do not have written authorization, do not repeat Chapter 4. Use of Ansible in large projects RolesIf your playbooks start expanding beyond what includes can help you solve, or youstart gathering a large number of templates, you may want to use

Ansible @ an efficient configuration management tool-Ansible configure management-translation (10), ansible-ansibleNo written permission. Do not reprint it Custom ModulesUntil now we have been working solely with the tools provided to us by Ansible.This does afford us a lot of power, and make many things possible. However, if youhave something particularly compl

worksDelegation of tasksAnsible performs tasks on the configured machine by default and is useful when you have a lot of machines to configure or every device can reach.But. When you need to perform a task on another ansible control machine, you need to use task delegation.The ability to delegate tasks to other machines is performed using Delegate_tokeyword. The fact that is available at the same time will also use the value on the delegated machine. The following sample uses Get_url to all web

new partition type. P is the primary partition and E is the extended partition (the E will be here when there is an extended partition present). into l, i.e. logical partition)2) Set the partition number. Primary partition or extended partition is 1-4, logical partition is 5 start3) Set the start location of the partition. (General return default is good)4) Set the end location of the partition. (100 unit is sector, +100m Unit is m,+100k Unit is k)④ to see if the partition was successful with t

Redis is defined as a service process that can run for a long time at the beginning of the design, so most system configuration parameters can take effect immediately without restarting. Even if the current persistence mode switches from aof to RDB, there is no need to restart. In Redis, we also have some commands related to server management, which we introduce

Memory Management details in redis, redismemory details Memory Management in redis The implementation of applying for memory in redis is in zmalloc. c/h. After carefully reading these two files, you can return to redis for applyi

| Success >> {"Changed": false, "ping": "Pong"}this indicates that's can connect and use Ansible on all the hosts fro M yourinventory. You can use the Same-i argument with Ansible-playbook to run Yourplaybooks with the same inventory.Same as the first chapter. The output looks like this:localhost | Success >> {"Changed": false,"Ping": "Pong"}Example | Success >> {"Changed": false,"Ping": "Pong"}You can connect all the machines in the list. You can also use the-I parameter to perform playbook.Su

, the behavior of the copy, the template, and the script modules isslightly altered. Instead of searching for files by looking from the directory in whichthe playbook file is located, Ansible will look for the files in the location of the role.For example, if you are using a role named common , these modules will change to thefollowing behavior:? The copy module will look for files in roles/common/files .? The template module will look for templates in roles/common/templates .? The script module

Ansible @ an efficient configuration management tool-Ansible configure management-translation (4), ansible-ansibleDo not reprint without written permission Due to the long content in Chapter 3, I will divide it into several parts for translation. Advanced PlaybooksSo far the playbooks that we have looked at are simple and just run a number ofmodules in order. An

times of COMMIT$ Git commit-M "fixed severe production problem"Hotfix branch finishedAt the end, the bugfix will be merged to the master and the develop together to ensure that the bug has been fixed during the next release. This is the same as when release branch is finished.First, update master and tag release.$ Git checkout master$ Git merge -- no-FF hotfix-1.2.1$ Git tag-A 1.2.1Merge with develop$ Git checkout develop$ Git merge -- no-FF hotfix-1.2.1There is an exception, that is, when a re

(used_memory, (__n)) #else # define UPDATE_ZMALLOC_STAT_ADD (__n) do { Pthread_mutex_lock (used_memory_mutex); Used_memory + = (__n); Pthread_mutex_unlock (used_memory_mutex); } while (0) #define UPDATE_ZMALLOC_STAT_SUB (__n) do { pthread_mutex_lock (used_memory_mutex); Used_memory-= (__n); Pthread_mutex_unlock (used_memory_mutex); } while (0) #endifThe memory management of the Redis