1、修改grub.cfg内的timeout配置
grub.cfg位于/boot/grub2文件夹内
将其中63行和67行的timeout=5修改为timeout=1
2、打开networkManager.service服务
systemctl enable NetworkManager.service
输入命令后如果没有输出信息证明该服务已经打开，跳过此步骤
3、修改rc.local脚本
修改rc.local脚本如下（不包含上电自启动的应用程序）
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.modprobe ipmi_devintf
modprobe ipmi_si ports=0x360
ipmitool raw 6 0x26cd /home/Xilinx_Answer_65444_Linux_Files/tests
./load_driver.shcd /home/dal/dal
insmod dal_kernel.kochmod 777 /opt/pet/vpx_net.sh
/opt/pet/vpx_net.shrm -f /tmp/.X11-unix/X*
rm -f /.VNC/*.pid
rm -f /.VNC/*.log
4、修改vpx_net.sh脚本
vpx_net.sh脚本修改为检测到槽位号不变后不再重新配置网络
#!/bin/bashvpx_eth_name=("enp2s0f0" "enp2s0f1" "enp7s0" "enp9s0f0" "enp9s0f1" "enp9s0f2" "enp9s0f3")net_vpx_autocfg()
{echo "vpx_net_autocfg"vpx_get_eth_name=(${vpx_eth_name[*]})cd /opt/petget_info=`./slot_test`get_slotid=$(echo $get_info | cut -d ' ' -f 1)get_chassisid=$(echo $get_info | cut -d ' ' -f 2)get_rackid=$(echo $get_info | cut -d ' ' -f 3)org_slotid=$(echo `hostname` | cut -d '-' -f 1 | tr -cd "[0-9]")org_chassisid=$(echo `hostname` | cut -d '-' -f 2)#printf 'slot is %d\n' $get_slotid#printf 'chasis is %d\n' $get_chassisid#printf 'rack is %d\n' $get_rackidif [ $get_slotid == $org_slotid ] && [ $get_chassisid == $org_chassisid ]thenecho "do not change network"elsehostnamectl set-hostname node${get_slotid}-${get_chassisid}cd /opt/pet/netunalias cpcp ifcfg-enp* /etc/sysconfig/network-scripts/cd /etc/sysconfig/network-scripts/get_ip4=$(expr $get_slotid \* 10 + $get_chassisid)ifdown ifcfg-${vpx_get_eth_name[0]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[0]}echo "IPADDR=192.168.80.$get_ip4" >> ifcfg-${vpx_get_eth_name[0]}ifup ifcfg-${vpx_get_eth_name[0]}ifdown ifcfg-${vpx_get_eth_name[1]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[1]}echo "IPADDR=192.168.90.$get_ip4" >> ifcfg-${vpx_get_eth_name[1]}ifup ifcfg-${vpx_get_eth_name[1]}ifdown ifcfg-${vpx_get_eth_name[2]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[2]}echo "IPADDR=192.168.100.$get_ip4" >> ifcfg-${vpx_get_eth_name[2]}ifup ifcfg-${vpx_get_eth_name[2]}ifdown ifcfg-${vpx_get_eth_name[3]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[3]}echo "IPADDR=192.168.3.$get_ip4" >> ifcfg-${vpx_get_eth_name[3]}ifup ifcfg-${vpx_get_eth_name[3]}ifdown ifcfg-${vpx_get_eth_name[4]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[4]}echo "IPADDR=192.168.4.$get_ip4" >> ifcfg-${vpx_get_eth_name[4]}ifup ifcfg-${vpx_get_eth_name[4]}ifdown ifcfg-${vpx_get_eth_name[5]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[5]}echo "IPADDR=192.168.5.$get_ip4" >> ifcfg-${vpx_get_eth_name[5]}ifup ifcfg-${vpx_get_eth_name[5]}ifdown ifcfg-${vpx_get_eth_name[6]}sed -i '/IPADDR=/d' ifcfg-${vpx_get_eth_name[6]}echo "IPADDR=192.168.6.$get_ip4" >> ifcfg-${vpx_get_eth_name[6]}ifup ifcfg-${vpx_get_eth_name[6]}sleep 1systemctl stop network.service sleep 1systemctl start network.service fi
}net_vpx_autocfg5、查看开机启动耗时服务，关闭部分服务
输入systemd-analyze blame可查看系统启动各项服务耗时
可以关闭的服务如下，在终端中输入即可，如果没有返回值表面该服务已经关闭或不存在
systemctl disable lvm2-monitor.service
systemctl disable accounts-daemon.service
systemctl disable lm-sensors.service
systemctl disable kylin-dmesg.service
systemctl disable cups.path
systemctl disable cups-browsed.service
systemctl disable cups.service
systemctl disable NetworkManager-wait-online.service
systemctl disable remote-fs.target
systemctl disable lvm2-lvmetad.socket
systemctl disable lvm2-lvmpolld.socket
systemctl disable kylin-activation-check.service
systemctl disable apt-daily.timer
systemctl disable pppd-dns.service
