Pay special attention to the processes in this group as to the most probable cause out-of-memory issues (sorted based on server role):
- Load Balancers
- Application Servers
- Database Servers
- Common Processes for Different-Type Stacks
- Load Balancers
Common recommendations
Allocate more RAM to a corresponding node - handled services could just require more memory for normal operability.
Related processes
| Process | Resolution |
|---|---|
| varnishd | Allocate more RAM to a node - handled services could just require more memory for normal operability |
- Application Servers
Click on points within the list below to view some common recommendations on dealing with memory shortage issues considering used programming language, as well as appropriate resolutions for the most demanding related processes:
- Java
Common recommendations
Review the main memory management configurations for the Java machine and, if required, adjust them according to the application needs, e.g.:
java -Xmx2048m -Xms256m
where - Xmx flag specifies the maximum heap memory that could be allocated for a Java Virtual Machine (JVM)
-
Xms flag defines initial memory allocation pool
Refer to the official documentation for more info on Java memory management system.
- PHP
- Database Servers
Click on the required DB stack within the list below to reveal appropriate common recommendations on coping with OOM issues, as well as resolutions for particular killed processes:
Common Processes for Different-Type Stacks
Common recommendations
Processes in this section can be run and, subsequently, killed within different node types. Thus, OOM resolutions for them vary and depend on a process itself - see the table below to find the appropriate recommendations.
- Related processes
| Process | Stack | Resolution |
|---|---|---|
| httpd | PHP Ruby Python MySQL MongoDB PostgreSQL |
1. Check the average amount of RAM, used by each httpd instance 2. Remove the Jelastic autoconfiguration mark within the /etc/httpd/httpd.conf file 3. Decrease ServerLimit and MaxClients values according to the formula: (Total_RAM - 5%) / Average_RAM |
| lsyncd | PHP NodeJS Python |
Allocate more RAM to a node - handled services could just require more memory for normal operability |
| httpd.itk | PHP Ruby Python |
1. Check the average amount of RAM, used by each httpd instance 2. Remove the Jelastic autoconfiguration mark within the /etc/httpd/httpd.conf file 3. Decrease ServerLimit and MaxClients values according to the formula: (Total_RAM - 5%) / Average_RAM |
| procmail | Any | Restart container in order to restore the process |
| vsftpd | Any | |
| yum | Any | |
| cc1 | 3rd party | Allocate more RAM to a node - handled services could just require more memory for normal operability |
| clamd | 3rd party | |
| ffmpeg | 3rd party | |
| firefox | 3rd party | |
| newrelic-daemon | 3rd party | Restart the main stack service (nginx, tomcat, nodejs, etc) |