# 1. 查看当前内核参数
$ sysctl -a | grep kernel
# 执行
# 输出日志
kernel.sched_child_runs_first = 0
kernel.sched_autogroup_enabled = 1
kernel.sched_migration_cost_ns = 500000
kernel.sched_wakeup_granularity_ns = 10000000
kernel.sched_tunable_scaling = 1
kernel.sched_min_granularity_ns = 15000000
kernel.sched_latency_ns = 60000000
kernel.sched_wrr_timeslice_ms = 100
kernel.hung_task_timeout_secs = 120
kernel.printk = 4 4 1 7
kernel.sysrq = 16
kernel.core_pattern = core
kernel.core_uses_pid = 1
kernel.kptr_restrict = 1
kernel.dmesg_restrict = 0
kernel.keys.root_maxkeys = 1000000
kernel.keys.root_maxbytes = 200000000
kernel.keys.maxkeys = 200
kernel.keys.maxbytes = 20000
kernel.pid_max = 32768
kernel.threads-max = 65536
# 2. 配置内核参数
$ vi /etc/sysctl.conf
# 执行
# 输出内容
# 共享内存
kernel.shmmax = 8589934592
kernel.shmall = 2097152
kernel.shmmni = 4096
# 信号量
kernel.sem = 250 32000 100 128
# 文件描述符
fs.file-max = 6815744
# 网络参数
net.core.somaxconn = 4096
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15
# 内存管理
vm.swappiness = 10
vm.overcommit_memory = 0
vm.overcommit_ratio = 50
# 使配置生效
$ sysctl -p
# 执行
# 输出日志
kernel.shmmax = 8589934592
kernel.shmall = 2097152
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
fs.file-max = 6815744 风哥提示：
net.core.somaxconn = 4096
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15
vm.swappiness = 10
vm.overcommit_memory = 0
vm.overcommit_ratio = 50
# 3. 配置文件描述符
$ vi /etc/security/limits.conf
# 执行
# 输出内容
* soft nofile 65536
* hard nofile 65536
dmdba soft nofile 65536
dmdba hard nofile 65536
dmdba soft nproc 65536
dmdba hard nproc 65536
# 4. 配置大内存页
$ vi /etc/sysctl.conf
# 执行
# 输出内容
vm.nr_hugepages = 16384
# 使配置生效
$ sysctl -p
# 执行
# 输出日志
vm.nr_hugepages = 16384
# 5. 关闭透明大页 学习交流加群风哥微信: itpux-com
$ vi /etc/rc.d/rc.local
# 执行
# 输出内容
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
# 赋予执行权限
$ chmod +x /etc/rc.d/rc.local
# 执行
# 输出日志
# 6. 关闭NUMA
$ vi /etc/default/grub
# 执行
# 输出内容
GRUB_CMDLINE_LINUX=”crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet numa=off”
# 更新grub
$ grub2-mkconfig -o /boot/grub2/grub.cfg
# 执行
# 输出日志
Generating grub configuration file …
Found linux image: /boot/vmlinuz-3.10.0-1160.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Found initrd image: /boot/initramfs-0-rescue-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.img
done

#!/bin/bash
# filesystem_optimization.sh
# from:www.itpux.com.qq113257174.wx:itpux-com
# web: `http://www.fgedu.net.cn`
# 文件系统优化函数
function filesystem_optimize() {
echo “=== 文件系统优化 ===”
# 查看文件系统
echo “1. 查看文件系统”
df -h
# 优化挂载参数
echo “2. 优化挂载参数”
cat >> /etc/fstab << EOF 学习交流加群风哥QQ113257174 /dev/sdb1 /dm ext4 defaults,noatime,nodiratime,barrier=0 0 0 /dev/sdc1 /dm/data ext4 defaults,noatime,nodiratime,barrier=0 0 0 /dev/sdd1 /dm/log ext4 defaults,noatime,nodiratime,barrier=0 0 0 /dev/sde1 /dm/backup ext4 defaults,noatime,nodiratime 0 0 EOF # 重新挂载文件系统 echo "3. 重新挂载文件系统" mount -a # 查看挂载参数 echo "4. 查看挂载参数" mount | grep /dm # 调整文件系统参数 echo "5. 调整文件系统参数" tune2fs -o journal_data_writeback /dev/sdb1 tune2fs -o journal_data_writeback /dev/sdc1 tune2fs -o journal_data_writeback /dev/sdd1 # 查看文件系统状态 echo "6. 查看文件系统状态" tune2fs -l /dev/sdb1 | grep "Filesystem features" } # 磁盘性能测试 function disk_performance_test() { echo "=== 磁盘性能测试 ===" # 测试顺序读写性能 echo "1. 测试顺序读写性能" dd if=/dev/zero of=/dm/test.file bs=1M count=1024 oflag=direct # 测试随机读写性能 echo "2. 测试随机读写性能" fio --name=randwrite --ioengine=libaio --iodepth=16 --rw=randwrite --bs=4k --size=1G --numjobs=4 --runtime=60 --group_reporting } # 执行文件系统优化 echo "开始文件系统优化..." filesystem_optimize disk_performance_test echo "文件系统优化完成!"