I created a log file, but it still got error log with the FileNotFoundExceptio

[xiangzirui]

java.io.FileNotFoundException: /opt/sw-jar/logs/skywalking-api.log (Permission denied) at java.io.FileOutputStream.open0(Native Method) at java.io.FileOutputStream.open(FileOutputStream.java:270) at java.io.FileOutputStream.<init>(FileOutputStream.java:213) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.prepareWriteStream(FileWriter.java:217) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.writeToFile(FileWriter.java:107) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.access$100(FileWriter.java:43) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter$1.run(FileWriter.java:74) at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33) at java.lang.Thread.run(Thread.java:748) [2024-04-23 21:32:20.151][INFO][main][o.a.catalina.core.ContainerBase.[Tomcat].[localhost].[/].log:173] - [Initializing Spring embedded WebApplicationContext] [2024-04-23 21:32:20.152][INFO][main][o.s.b.w.s.context.ServletWebServerApplicationContext.prepareWebApplicationContext:289] - [Root WebApplicationContext: initialization completed in 22572 ms] java.io.FileNotFoundException: /opt/sw-jar/logs/skywalking-api.log (Permission denied) at java.io.FileOutputStream.open0(Native Method) at java.io.FileOutputStream.open(FileOutputStream.java:270) at java.io.FileOutputStream.<init>(FileOutputStream.java:213) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.prepareWriteStream(FileWriter.java:217) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.writeToFile(FileWriter.java:107) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.access$100(FileWriter.java:43) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter$1.run(FileWriter.java:74) at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33) at java.lang.Thread.run(Thread.java:748) java.io.FileNotFoundException: /opt/sw-jar/logs/skywalking-api.log (Permission denied) at java.io.FileOutputStream.open0(Native Method) at java.io.FileOutputStream.open(FileOutputStream.java:270) at java.io.FileOutputStream.<init>(FileOutputStream.java:213) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.prepareWriteStream(FileWriter.java:217) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.writeToFile(FileWriter.java:107) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.access$100(FileWriter.java:43) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter$1.run(FileWriter.java:74) at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33) at java.lang.Thread.run(Thread.java:748) [2024-04-23 21:32:21.215][INFO][main][o.s.scheduling.concurrent.ThreadPoolTaskExecutor.initialize:181] - [Initializing ExecutorService 'applicationTaskExecutor'] java.io.FileNotFoundException: /opt/sw-jar/logs/skywalking-api.log (Permission denied) at java.io.FileOutputStream.open0(Native Method) at java.io.FileOutputStream.open(FileOutputStream.java:270) at java.io.FileOutputStream.<init>(FileOutputStream.java:213) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.prepareWriteStream(FileWriter.java:217) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.writeToFile(FileWriter.java:107) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.access$100(FileWriter.java:43) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter$1.run(FileWriter.java:74) at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33) at java.lang.Thread.run(Thread.java:748) java.io.FileNotFoundException: /opt/sw-jar/logs/skywalking-api.log (Permission denied) at java.io.FileOutputStream.open0(Native Method) at java.io.FileOutputStream.open(FileOutputStream.java:270) at java.io.FileOutputStream.<init>(FileOutputStream.java:213) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.prepareWriteStream(FileWriter.java:217) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.writeToFile(FileWriter.java:107) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter.access$100(FileWriter.java:43) at org.apache.skywalking.apm.agent.core.logging.core.FileWriter$1.run(FileWriter.java:74) at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:33) at java.lang.Thread.run(Thread.java:748)

[wu-sheng]

I don't know why you create file manually, the agent should create the file automatically. Permission denied means this file can't be opened to read, this is a Linux thing.

[xiangzirui]

Doesn't skywalking agent give root permission? why doesn't it have access to directories in my program?
I haven't solved this problem for three weeks. Every time I start the service, I report an error, which makes me very anxious.
Thank you for your help.

[wu-sheng]

Who gives? Agent is just a file. This is your OS, rather than us.

[wu-sheng]

The agent is running as an attachment into your target service. I think you understand the runtime wrong.

[xiangzirui]

After you said who gives, I understood the directory access I should have given me in the container. Now that the problem has been solved, thank you for your patient guidance.