uptime guarantee

CopyMongoDB replication is important, especially now that the storage engine does not support click Persistence. Not only can replication be used to deal with failover, data integration, but also read extensions, hot backups, or data sources as

IOS Time Processing Do not have to do the app to deal with time, about the processing of time, there are many doorways, far from a row of API calls, get the current system time so simple. We need to understand the differences between the various

It's classic. I use it.DeploymentsThe deployments in this document were implemented in an isolated lab environment. the deployments were cleared by issuing the write erase command on the routers, and the clear config all command on the switches to

Why is the server so slow? CPU, RAM, and disk I/O resources are exhausted, and ram is used up Machine running is slow because it consumes too many system-specific resources. The main resources of the system include CPU, RAM, disk I/O, and network.

First, the introduction of replicationThe so-called replication is the process of synchronizing data between multiple hosts.1. Data redundancy and availabilityReplication technology provides data redundancy and availability, using multiple copies of

Note: This content is excerpted from the "DevOps Troubleshooting: Best Practices for Linux server Operations" book System load The average system load is probably the first basic metric to use when solving problems that cause the

When I read the SQL Server resource kit today, I mentioned the availability of the system (Availablity) I found that many of my previous understandings are still incorrect. 1. 99.9 is easily guaranteed? It is hard to guarantee. 99.9, that is.

Linux clock interrupts involve up to two global variables one is xtime and the other is jiffies.There is a time-related clock: Real time Clock (RTC), which is a hardware clock that is used to keep the system time in place, and the system shuts down

The strange reason why php-fpm occupies CPU 100% recently, I used the online lnmp one-click installation and configuration of the environment below the net centos6.2 of Lotto. after a few days, I found that php-fpm occupies CPU 100%, you can run the

Read these three chapters and then look back at your system and feel ashamed. Because writing this system, is the faith to complete the work of the mentality to write, so a lot of good features from the imperfect, can not actually run, the original