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Confirm and Change File LIMIT

To increase the maximum number of files that can be opened, do the following.

  1. Modify the file /etc/security/limits.conf

    Code Block
    sudo vi /etc/security/limits.conf
*       hard   nofile      65535
*       soft   nofile      65535


  2. Reboot.

    Code Block
    bash
    bash
    sudo reboot
# or
sudo shutdown -r now


  3. Check the results. If the output is 65535, it has been successfully changed.

    Code Block
    bash
    bash
    ulimit -Sn


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Server Time Synchronization

You must synchronize the server time between each host. If they are already synchronized, check for confirmation.

  1. Synchronize the time on all servers with the time server. 

    Code Block
    bash
    bash
    # Synchronize with the following command.                       
/usr/bin/rdate -s time.bora.net && /sbin/clock -w


  2. If the time server can not be used, modify it with a direct command.

    Code Block
    bash
    bash
    # Modify with the following command.                                  
date -s "2017-10-31 11:15:30"


  3. Check the modified time

    Code Block
    bash
    bash
    # Check with the following command.                                  
date



Change Network Kernel Parameters

  1. Check the current set value.

    Code Block
    bash
    bash
    Check with the following command.                                  
sysctl -a | egrep 'mem_(max|default)|tcp_.*mem'


  2. Change the setting value with the following command (for 64GB Memory).

    Code Block
    bash
    bash
    sysctl -w net.core.rmem_default = "33554432"     # 32MB
sysctl -w net.core.wmem_default = "33554432"
sysctl -w net.core.rmem_max     = "268435456"    # 256MB
sysctl -w net.core.wmem_max     = "268435456"   
sysctl -w net.ipv4.tcp_rmem     = "262144 33554432 268435456" 
sysctl -w net.ipv4.tcp_wmem     = "262144 33554432 268435456"

# 8388608 Page * 4KB = 32GB 
sysctl -w net.ipv4.tcp_mem      = "8388608 8388608 8388608"


  3. To keep the changes, add them to the /etc/sysctl.conf file and restart the host OS.

    Code Block
    bash
    bash
    # Modify the file /etc/sysctl.conf.
net.core.rmem_default = "33554432"
net.core.wmem_default = "33554432"
net.core.rmem_max     = "268435456"
net.core.wmem_max     = "268435456"
net.ipv4.tcp_rmem     = "262144 33554432 268435456" 
net.ipv4.tcp_wmem     = "262144 33554432 268435456"
net.ipv4.tcp_mem      = "8388608 8388608 8388608"



Create User

  1. Create a Linux OS user 'machbase' for Machbase installation. The user account directory is created as: /home/machbase.

    Code Block
    bash
    bash
    $ sudo useradd machbase --home-dir "/home/machbase"


  2. Set password (machbase)

    Code Block
    bash
    bash
    sudo passwd machbase