Preparing for Cluster Edition Installation

Confirm and Change File LIMIT

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

Modify the file /etc/security/limits.conf

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

Reboot.

sudo reboot
# or
sudo shutdown -r now

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

ulimit -Sn

Server Time Synchronization

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

Synchronize the time on all servers with the time server.

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

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

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

Check the modified time

# Check with the following command.                                 
date

Change Network Kernel Parameters

Check the current set value.

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

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

sudo sysctl -w net.core.rmem_default=33554432     # 32MB
sudo sysctl -w net.core.wmem_default=33554432
sudo sysctl -w net.core.rmem_max=268435456        # 256MB
sudo sysctl -w net.core.wmem_max=268435456
sudo sysctl -w 'net.ipv4.tcp_rmem=262144 33554432 268435456'
sudo sysctl -w 'net.ipv4.tcp_wmem=262144 33554432 268435456'
 
# 8388608 Page * 4KB = 32GB
sudo sysctl -w 'net.ipv4.tcp_mem=8388608 8388608 8388608'

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

# 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

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

$ sudo useradd machbase --home-dir "/home/machbase"

Set password (machbase)

sudo passwd machbase

Last updated on Jun 13, 2026