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Last modified by Carlijn Kokkeler on 2024/09/17 15:13
From version 8.1
edited by Tudor Neacsu
on 2024/06/21 08:59
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To version 3.1
edited by Eva Torken
on 2024/03/22 15:42
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1 -Runtime Overview Exit codes
1 +No Data Delivered to Backend System
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1 -XWiki.TudorNeacsu
1 +XWiki.etorken
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1 1  {{container}}{{container layoutStyle="columns"}}(((
2 -In this microlearning, we will give insights into what is an exit code, the main exit codes returned by a container when it stops and how can that help a Support Engineer to conduct an RCA.
2 +In this document, we will use the information from the actual root cause analysis to make a generic view that can be used if you run into the same or a similar problem in the future. Finally, the document will describe the situation, the problem, the analysis, and the result.
3 3  
4 4  Should you have any questions, please get in touch with [[academy@emagiz.com>>mailto:academy@emagiz.com]].
5 5  
6 -== 1. Key concepts ==
6 +== 1. Situation ==
7 7  
8 +No data is delivered to a backend system.
8 8  
9 -== 2. Exit code values ==
10 +== 2. Problem ==
10 10  
11 -* Exited with code *0*: The application inside the container completed its work successfully without any errors.
12 +The problem in this case was that the backend system was not receiving any data. This was caused by an unstable H2 database.
12 12  
13 -* Exited with code 1: There was a general error in the application, which could be due to a variety of reasons like incorrect arguments or a failed dependency.
14 +== 3. Analysis ==
14 14  
15 -* Exited with code 125: The docker run command was not executed successfully
16 +=== 3.1 Reproduction ===
16 16  
17 -* Exited with code 126: The command inside the container was found but cannot be executed. This can be due to permission issues or if the command is not executable.
18 +N/A
18 18  
19 -* Exited with code 127: The command was not found. This usually happens if a script is missing or the path is not set correctly.
20 +=== 3.2 Analysis ===
20 20  
21 -* Exited with code 137: The container was forcefully stopped. This happens when the container exceeds its memory resource limit (OOM)
22 +The problem led us to investigate the health of the H2 database. The database had a very high CPU and had high CPU after the connector underwent auto-healing. After further investigation it seemed that the H2 was reprocessing messages and therefore not taking on new ones.
22 22  
23 -* Exited with code 139: The application inside the container crashed due to a segmentation fault, which is usually caused by accessing memory that the process does not have permission to access.
24 -* Exited with code 255: Container exited, returning an exit code outside the acceptable range, meaning the cause of the error is not known
24 +== 4. Result ==
25 25  
26 +The removal and re-addition of the H2 database caused the H2 database to return to normal behavior. Afterwards, the problem did not reoccur.
26 26  
27 27  == 5. Suggested Additional Readings ==
28 -For more information on resetting a H2 Database, please check out the following microlearning:
29 -* [[Reset H2 Database>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.eMagiz Runtime Management.intermediate-runtime-management-reset-h2.WebHome||target="blank"]]
29 +N/A
30 30  
31 31  
32 32  )))((({{toc/}}))){{/container}}{{/container}}