三、调整操作系统相应服务和参数
禁用 SELINUX setenforce 0 sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config getenforce 修改为 DISABLE
关闭Transparent HugePages 修改/etc/grub.conf文件，在Kernel行末尾加上下列参数： transparent_hugepage=never
IO调度算法调整 修改/etc/grub.conf文件，在Kernel行末尾加上下列参数： elevator=deadline 可以通过cat /sys/block/sda/queue/scheduler命令来查看目前调度算法。
配置服务 service iptables stop service iptables save service ip6tables stop service ip6tables save chkconfig avahi-daemon off chkconfig bluetooth off chkconfig cpuspeed off chkconfig cups off chkconfig firstboot off chkconfig ip6tables off chkconfig iptables off chkconfig pcmcia off
内核参数修改 cat>>/etc/sysctl.conf<<EOF kernel.shmmax = 54050481766 kernel.shmall = 16494898 kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 fs.file-max = 6815744 fs.aio-max-nr = 4194304 net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 1048576 net.ipv4.ipfrag_high_thresh = 16777216 net.ipv4.ipfrag_low_thresh = 15728640 kernel.randomize_va_space=0 vm.min_free_kbytes = 524288 # vm.nr_hugepages = 512 EOF 最佳配置算法: #shmmax echo "`cat /proc/meminfo | grep "MemTotal" | awk '{print $2}'` * 1024 * 0.8" | bc | sed 's#\..*$##' #shmall echo "`cat /proc/meminfo | grep "MemTotal" | awk '{print $2}'` / (`getconf PAGESIZE` / 1024)" | bc 使参数生效 sysctl -p
Limits配置 cat>>/etc/security/limits.conf<<EOF oracle soft nproc 2047 oracle hard nproc 16384 oracle soft nofile 1024 oracle hard nofile 65536 oracle soft stack 10240 oracle hard stack 32768 root soft stack 10240 root hard stack 32768 * soft memlock unlimited * hard memlock unlimited EOF
PAM 调整 echo "session required pam_limits.so" >>/etc/pam.d/login
