Linux Environment Configuration
This section describes the configuration of the Linux system before installing AntDB, including user creation, dependency installation, and system parameter adjustment.
User Configuration
New User Creation
Create a new normal user, such as uatadb, on all hosts where AntDB is to be installed (or use an existing normal user). New user reference example.
useradd -d /home/uatadb uatadb
passwd uatadb
Configure the user limit parameters
Edit the /etc/security/limits.conf file and configure the
antdb user parameters.
antdb soft nproc 65536
antdb hard nproc 65536
antdb soft nofile 278528
antdb hard nofile 278528
antdb soft stack unlimited
antdb soft core unlimited
antdb hard core unlimited
antdb soft memlock 250000000
antdb hard memlock 250000000
After saving the file, execute su - antdb to switch to antdb user and execute ulimit -a to check if it takes effect.
Configure user sudo privileges
If security allows, it is recommended to add sudo privileges to the antdb user. Execute visudo for the root user to edit the interface, find the line where Allow root to run any commands anywhere, and add below the line.
antdb ALL=(ALL) ALL
Save the file and exit. su - antdb Switch to the antdb user and execute sudo id. Expect to be prompted for the user password and the output will be:
uid=0(root) gid=0(root) groups=0(root)
indicates that sudo privileges were added successfully.
System parameter adjustment
Turn off the firewall
Use the centos 7 operating system as an example：
- Disable the firewall service.
systemctl stop firewalld.service
- Disable the firewall self-start service.
systemctl disable firewalld.service
- Check the firewall status.
systemctl status firewalld.service
Shut down numa and tuned
Take redhat/centos 7 system as an example.
- Shut down numa.
grubby --update-kernel=ALL --args="numa=off " #this command modifies the following file:
/etc/grub2.cfg
grub2-mkconfig
- Shut down the tuned service.
systemctl stop tuned
systemctl disable tuned
- Reboot the host after the changes in this way take effect.
reboot
- Verify the cmdline of grub after rebooting.
cat /proc/cmdline
- Check numa
numactl --hardware
The expected result is: Available: 1 nodes (0)
Turn off Transparent Huge Pages
The use of Transparent Huge Pages (THP for short) can cause performance problems, so it is recommended to turn them off.
- Check the on status of Transparent Huge Pages.
cat /sys/kernel/mm/transparent_hugepage/enabled
If the result is [always] madvise never, then Transparent Huge Pages is on and needs to be turned off; if the result is always madvise [never], then Transparent Huge Pages is off and this step is skipped; 2. Turn off Transparent Huge Pages.
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag checks the on status of Transparent Huge Pages
- Check again that the Transparent Big Page is on.
cat /sys/kernel/mm/transparent_hugepage/enabled
Configure sysctl.conf
- Modify the sysctl.conf file.
cat >> /etc/sysctl.conf << EOF
# add for antdb
kernel.shmmax=137438953472 137438953472
kernel.shmall=53689091
kernel.shmmni=4096
kernel.msgmnb=4203520
kernel.msgmax=65536
kernel.msgmni=32768
kernel.sem=501000 641280000 501000 12800
fs.aio-max-nr=6553600
fs.file-max=26289810
net.core.rmem_default=8388608
net.core.rmem_max=16777216
net.core.wmem_default=8388608
net.core.wmem_max=16777216
net.core.netdev_max_backlog=262144
net.core.somaxconn= 65535
net.ipv4.tcp_rmem=8192 87380 16777216
net.ipv4.tcp_wmem=8192 65536 16777216
net.ipv4.tcp_max_syn_backlog=262144
net.ipv4.tcp_keepalive_time=180
net.ipv4.tcp_keepalive_intvl=10
net.ipv4.tcp_keepalive_probes=3
net.ipv4.tcp_fin_timeout=1
net.ipv4.tcp_synack_retries=1
net.ipv4.tcp_syn_retries=1
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_timestamps=1
net.ipv4.tcp_tw_recycle=1
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_max_tw_buckets=256000
net.ipv4.tcp_retries1=2
net.ipv4.tcp_retries2=3
vm.dirty_background_ratio=5
vm.dirty_expire_centisecs=6000
vm.dirty_writeback_centisecs=500
vm.dirty_ratio=20
vm.overcommit_memory=0
vm.overcommit_ratio= 120
vm.vfs_cache_pressure = 100
vm.swappiness=10
vm.drop_caches = 2
vm.min_free_kbytes = 2048000
vm.zone_reclaim_mode=0
kernel.core_uses_pid=1
kernel.core_pattern= /data/antdb/core/core-%e-%p-%s-%t
fs.suid_dumpable=1
kernel.sysrq=0
EOF
The path of kernel.core_pattern needs to be modified according to the actual environment information. 2. execute the following command to make the above parameters effective.
sysctl -p
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