AWS按需Bamboo服务器内存不足，如何分配内存？

Hey there! Let's walk through how to fix that JVM out-of-memory error for your Bamboo server running on AWS. Since you're new to both, I'll keep this step-by-step and easy to follow.

Before you adjust Bamboo's memory settings, you need to know how much RAM your EC2 instance actually has—you don't want to allocate more than the system can spare, which would cause more problems.

• Log into your EC2 instance (the server running Bamboo) via SSH.
• Run this command to see your memory stats:

  free -h
  

  Look for the Mem row—total is your instance's total RAM, available is what's free for Bamboo. As a general rule, allocate 60-75% of the available memory to Bamboo, leaving the rest for the OS and background processes. For example, if you have an 8GB instance, 4-6GB for Bamboo works well.

Bamboo stores its JVM settings in a startup configuration file, which varies slightly based on how you installed it:

• If you used the official Bamboo tar/zip package, head to your Bamboo installation directory, then go into the bin folder. You'll find a file named setenv.sh (for Linux) or setenv.bat (for Windows).
• If you deployed Bamboo via Docker, you'll need to pass the JVM parameters as environment variables when starting the container, but let's focus on the standard EC2 instance setup first.

Open the setenv.sh file with a text editor (like nano or vim). Look for lines that include -Xms (initial heap memory) and -Xmx (maximum heap memory)—these are the key settings you need to change.

• -Xms is the amount of RAM the JVM gets when it starts. It's best to set this equal to -Xmx to avoid the JVM constantly resizing its memory pool, which can cause performance hits.
• -Xmx is the maximum amount of RAM the JVM can use. Set this based on the memory check you did earlier.

Here's an example of what the modified line might look like (for a 8GB instance):

CATALINA_OPTS="-Xms4g -Xmx6g -XX:+UseG1GC -XX:MaxMetaspaceSize=512m"

A couple of extra tips here:

• -XX:+UseG1GC enables the G1 garbage collector, which is better suited for larger memory setups and helps prevent sudden pauses.
• -XX:MaxMetaspaceSize=512m sets a limit for the JVM's metaspace (where it stores class definitions), which can also cause out-of-memory errors if left unbounded.

Once you've saved the configuration file, you need to restart Bamboo for the new settings to take effect:

• Stop Bamboo by running this in the bin directory:

  ./stop-bamboo.sh
  

• Start it back up with:

  ./start-bamboo.sh
  

• If you're using Bamboo Remote Agents (separate servers running build tasks), you'll need to adjust their JVM settings too—look for bamboo-agent.sh/bamboo-agent.bat in the agent's bin folder, and tweak the same -Xms/-Xmx parameters.
• You can verify the settings worked by logging into Bamboo's admin panel: go to Settings > System > System Information, then look for "JVM Input Arguments" and "Heap Memory Usage" to confirm the new values are active.

内容的提问来源于stack exchange，提问作者Roxxy_9