This can cause issues with the application, as it would be blocked until logs are saved. A network can be slow or even periodically unavailable.
#DOCKER SYSLOG CONTAINER DRIVERS#
Which One to ChooseĬhoosing between these two delivery methods depends on what’s more important to you: performance or reliability.įor most use cases, the blocking mode is recommended, unless your logging drivers send logs over the network to a remote server. Also, if a container crashes, logs might simply get lost before being released from the buffer. The memory buffer the logs are stored in has a limited capacity, so it can fill up. Though the non-blocking delivery method sounds like a better approach, it also creates a risk of some log entries being lost.
#DOCKER SYSLOG CONTAINER DRIVER#
From there, logs will be delivered to wherever they need to be saved only when a logging driver is ready to process them. Instead of waiting until logs are saved to their destination, the container will write logs into a buffer in the container’s memory. This delivery method won’t block the application from executing to deliver logs. Non-BlockingĪs you may have guessed, non-blocking delivery works in the opposite way.
But in some high-usage cases, the interruption may be noticeable. In most cases, it’s not as bad as it sounds-you likely won’t notice any interruptions. Blocking delivery guarantees all log messages are saved to the destination because every time a container needs to write a log entry, Docker blocks an application execution until the log delivery is completed. Blockingĭocker defaults to the blocking delivery mode. The delivery method defines what’s more important: delivering logs or running the application. No matter which logging driver you end up with, you can configure it in blocking or non-blocking delivery mode. We’ll explain this in more detail in the next section. It’s best to think about both of these together because some logging drivers work better with one delivery method, and others work better with another. When choosing a delivery method, you should also consider the chosen logging driver. Delivery method defines the priority of log delivery.They can be saved in a file in the container, saved on the host where a container is running, shipped to a locally running service such as a syslog server or Journald, forwarded to another component like Fluentd, or sent directly to a remote log management service. Logging driver decides what to do with logs.We’ll explain why later, but first, let’s walk through what these two parameters do: They are, in theory, independent from each other, but you should think about both when changing one or the other. When it comes to optimizing logging for debugging, two configuration options play the biggest role: logging driver and delivery method. And the more containers you need to manage, the more important it becomes centralize log management. Additionally, when using Docker, we usually work with more than one container. This is why it’s important to understand the purpose of all the methods and know which one suits you best.
If you choose the wrong one, it can impact your application performance, or you may periodically lose some logs. At the same time, however, you need to choose which logging driver will be the best for you.
It has some so-called “logging drivers” built in, which allow you to customize logging for different purposes. What’s So Complicated About Docker Logging?ĭocker provides a few different ways to approach logging. In this post, you’ll learn the pros and cons of the different logging options and what to consider when choosing a logging strategy in Docker. You can simply execute docker logs, but it’s not always possible to use this command, and it’s not an ideal solution for bigger applications. However, when using Docker, this isn’t as straightforward as you may think. When this happens, the first step in the debugging process is usually to read logs. It solved many issues, but bugs can still occur. Docker changed the way developers build software.
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