Website downtime operation and maintenance manual: a guide to real-time monitoring and emergency response

For companies that rely on online business, the stable operation of the website is directly related to user experience and brand reputation, and website downtime is one of the most difficult emergencies in the operation and maintenance process. Once the website is down, a few minutes of interruption may cause user churn, order loss, and even cause negative word-of-mouth. This article will start from real-time monitoring, troubleshooting, emergency recovery to the whole process of post-mortem review to provide a set of landing website downtime response plans for operation and maintenance personnel to help everyone make early warnings before the crisis, and deal with it quickly when the crisis occurs to reduce all kinds of losses caused by website downtime.

, how to early warning website downtime?

want to reduce the impact of website downtime, early warning is the key, by building a multi-dimensional monitoring system, can catch abnormal signals before website downtime.

1, core indicators real-time monitoring

focus on monitoring the core operating metrics of the website, including server CPU usage, memory usage, disk IO, bandwidth traffic and database connections. When the metrics exceed the preset threshold, an alarm will be triggered immediately. For example, if the CPU usage lasts for 10 minutes and exceeds 80%, it may be a precursor to website downtime. Operation and maintenance personnel can intervene in advance to investigate and optimize to avoid problem escalation.

2, user side experience monitoring

In addition to server-side metrics, but also from the user's perspective to monitor the site's access, such as page loading time, HTTP status code, the availability of core functions, etc. With the help of third-party monitoring tools, simulation of different regions, different network environments of user access behavior, once found page loading timeout, 5xx error code, immediately push alarm information, so that the operation and maintenance personnel for the first time to perceive the front-end problems that may cause website downtime.

How to quickly check after the website is down?

when receiving the alarm information of the website downtime, quickly locating the root cause of the fault is the first step to solve the problem.

1, hierarchical investigation lock range

according to the order of hierarchical troubleshooting from the outside to the inside, first check whether the network link is normal, such as through ping, traceroute and other tools to confirm the server network connectivity, troubleshoot the website downtime caused by operator failure or network attack; then check the status of the server itself, confirm whether the server is running normally, whether the port is open; finally troubleshoot the application and database, view the error information in the log file, locate the specific code or configuration problems.

2, with the help of logs to quickly locate

a well-configured logging system in advance, including server system logs, application running logs, database operation logs, etc. After a website outage occurs, focus on viewing the error type and exception error information in the log, such as database connection timeout, code logic errors, etc. These information can help operation and maintenance personnel lock the failure point within a few minutes, saving time for subsequent recovery work.

What are the emergency recovery plans for website downtime?

after completing the fault investigation, it is necessary to take corresponding emergency recovery measures according to the different reasons for the website downtime, so that the website can resume normal operation as soon as possible.

1, hardware failure recovery program

if the website is down due to server hardware failure, you can immediately switch to the standby server, and the server mirroring and data backup done in advance can make the standby server quickly take over the business; if there is no standby server, you can urgently contact the service provider to replace the hardware equipment, and temporarily The website traffic is drained to static pages or CDN caches to ensure that users can access basic content.

2, software and data failure recovery

if the application code error caused by the site downtime, you can quickly roll back to a stable version, while suspending the release of new features, to be repaired after the failure to re-online; if it is a database failure, you can use the recent full backup and incremental backup to restore data, if the database exists leader/follower architecture, traffic can be switched to the library, first restore the basic access function of the website, and then gradually repair the main database problem.

How to avoid repeated website downtime?

the processing of website downtime can not only stay in the recovery stage, after the review and optimization can avoid the recurrence of similar website downtime events from the root cause.

1, carry out fault recovery analysis

website is down and restored, organize operation and maintenance, development, testing and other relevant personnel to carry out a review meeting to sort out the timeline, trigger reasons, processing process and existing deficiencies of the failure. For example, whether the website is down because the monitoring threshold is not set reasonably and the early warning is not timely, or because the emergency process is not clear and the processing is delayed, it must be recorded and analyzed one by one.

2, optimize the operation and maintenance system and architecture

optimize the operation and maintenance system according to the review results, such as adjusting the threshold of monitoring indicators and improving the emergency treatment process; at the same time, optimize the website architecture, such as increasing the server cluster to achieve load balance, building a database architecture with multi-live in different places, and improving the disaster tolerance of the website.

To sum up, the response to website downtime is a complete system from early warning to review. By building a multi-dimensional real-time monitoring system, the precursors of website downtime can be captured in advance, and the layered investigation can quickly lock the root cause of the failure. Targeted emergency plans can shorten the recovery time of website downtime, and the post-recovery optimization can reduce the occurrence of website downtime from the root cause. Operation and maintenance personnel need to form a closed loop in these links to build a solid line of defense for the stable operation of the website and ensure the continuous smooth operation of the business.