gh-oceanbase-ecology-plugins-seekdb-claudecode-plugin/skills/seekdb-docs/official-docs/400.guides/400.deploy/500.environment-and-configuration-checks/600.configure-sysctl-conf.md

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/configure-sysctl-conf

Configure sysctl.conf

This topic describes how to improve Linux system performance by modifying the sysctl.conf configuration on the machine.

If you are a personal user, you can skip this step. If you are an enterprise user, it is recommended to configure sysctl.conf.

Modify configuration

Run the following command to open the /etc/sysctl.conf configuration file:

sudo vim /etc/sysctl.conf

Add the following content to the /etc/sysctl.conf configuration file:

# for seekdb
## Modify kernel asynchronous I/O limits
fs.aio-max-nr = 1048576

## Network optimization
net.core.somaxconn = 2048
net.core.netdev_max_backlog = 10000 
net.core.rmem_default = 16777216 
net.core.wmem_default = 16777216 
net.core.rmem_max = 16777216 
net.core.wmem_max = 16777216
 
net.ipv4.ip_forward = 0 
net.ipv4.conf.default.rp_filter = 1 
net.ipv4.conf.default.accept_source_route = 0 
net.ipv4.tcp_syncookies = 1 
net.ipv4.tcp_rmem = 4096 87380 16777216 
net.ipv4.tcp_wmem = 4096 65536 16777216 
net.ipv4.tcp_max_syn_backlog = 16384 
net.ipv4.tcp_fin_timeout = 15 
net.ipv4.tcp_slow_start_after_idle=0

vm.swappiness = 0
vm.min_free_kbytes = 2097152
vm.overcommit_memory = 0

fs.file-max = 6573688
fs.pipe-user-pages-soft = 0

# Modify the number of virtual memory areas a process can own
vm.max_map_count = 655360

# Set the filename format and directory for core files
kernel.core_pattern = /data/core-%e-%p-%t

Here, /data in kernel.core_pattern is the data directory of seekdb.

:::tip

• If the max_map_count configuration is unreasonable, it may cause serious memory leaks.
• You need to reserve at least the same amount of disk space as the memory_limit configured for seekdb for the core file directory, and avoid affecting the available space of the data directory and log directory.

:::

Load configuration

After modifying the configuration, run the following command to load the configuration and make it take effect.

sysctl -p

ARM environment deployment recommendations

• Enable NUMA support in BIOS/UEFI and kernel boot parameters.

• In ARM and Hygon architecture environments, it is recommended to modify the configuration file /etc/sysctl.conf and set the parameters kernel.numa_balancing, vm.zone_reclaim_mode, and vm.swappiness to 0, as follows:

  [root@xxx /]
  $vi /etc/sysctl.conf
  ## Disable NUMA balancing to avoid performance jitter during balancing
  kernel.numa_balancing = 0
  ## Disable memory reclaim and reallocation functions
  vm.zone_reclaim_mode = 0
  vm.swappiness = 0
  

  Apply the values in the sysctl.conf configuration file:

  [root@xxx /]
  $sysctl -p