#安裝autofs工具
[root@rhel82 ~]# yum install -y autofs

#啟動autofs服務
[root@rhel82 ~]# systemctl start autofs
 
#autofs服務啟動后會有/misc/cd目錄,設置虛擬機連接光盤,實現(xiàn)自動掛載系統(tǒng)光盤
[root@rhel82 ~]# ll /misc/
總用量 0

[root@rhel82 ~]# cd /misc/cd
[root@rhel82 cd]# df -h
文件系統(tǒng)        容量  已用  可用 已用% 掛載點
devtmpfs        1.9G     0  1.9G    0% /dev
tmpfs           2.0G     0  2.0G    0% /dev/shm
tmpfs           2.0G   10M  2.0G    1% /run
tmpfs           2.0G     0  2.0G    0% /sys/fs/cgroup
/dev/nvme0n1p5   25G  4.4G   21G   18% /
/dev/nvme0n1p2 1014M  208M  807M   21% /boot
tmpfs           392M  1.2M  391M    1% /run/user/42
tmpfs           392M  4.6M  387M    2% /run/user/0
/dev/sr0        7.9G  7.9G     0  100% /misc/cd

[root@rhel82 ~]# rpm -ql autofs
[root@rhel82 ~]# rpm -qc autofs

# 比如掛載掛載光盤: mount /dec/sr0 /mnt/sr0 , 其中 /mnt目錄為dirname, /mnt/sr0為basename 等價于 /mnt/sr0 = /dirname/basename

[root@centos8 ~ ]# cat /etc/auto.master
/misc   /etc/auto.misc

[root@centos8 ~ ]# cat /etc/auto.misc
cd     -fstype=iso9660,ro,nosuid,nodev :/dev/cdrom

#特殊寫法:  掛載點dataname和掛載目錄dataname相同，即： mount 10.0.0.18:/data/www /misc/www
*	-fstype=nfg		10.0.0.18:/data/&

#服務端和客戶端安裝nfs-utils工具包
[root@server ~]# yum install -y nfs-utils
[root@client ~]# yum install -y nfs-utils
[root@server ~]# mkdir /nfs
[root@server ~]# cp /etc/passwd /nfs/

#centos6系統(tǒng)nfs服務叫做nfs.service
#centos7系統(tǒng)上nfs.service 和 nfs-server.service同一個服務
#centos8只有nfs-server.service服務

[root@server ~]# systemctl start nfs

#centos7系統(tǒng)可以解決服務之間依賴關系,并且nfs服務啟動會自動啟動rpcbind.service
[root@server ~]# systemctl status rpcbind

[root@server ~]# vim /etc/exports
/nfs  *(rw)

[root@server ~]# exportfs -r
[root@server ~]# exportfs -v
/nfs          	<world>(sync,wdelay,hide,no_subtree_check,sec=sys,rw,root_squash,no_all_squash)

[root@server ~]# systemctl restart nfs
[root@server ~]# showmount -e 192.168.192.128
Export list for 192.168.192.128:
/nfs *

[root@client ~]# showmount -e 192.168.192.128
Export list for 192.168.192.128:
/nfs *

[root@client ~]# mkdir /opt/nfs
[root@client ~]# mount 192.168.192.128:/nfs /opt/nfs/
[root@client ~]# df -h | grep nfs
192.168.192.128:/nfs   62G  1.7G   61G    3% /opt/nfs

#編寫autofs主配置文件
[root@client ~]# vim /etc/auto.master
/opt /etc/auto.master.d/auto.nfs

#編寫子配置文件
[root@client ~]# vim /etc/auto.master.d/auto.nfs
nfs     -fstype=nfs       192.168.192.128:/nfs

#掛載點/dirname是/目錄,查看autofs配置未生效,/目錄數(shù)據(jù)
[root@client ~]# cp /root/anaconda-ks.cfg  /opt/
[root@client ~]# ll /opt/
總用量 4
-rw-------. 1 root root 1453 12月  5 04:03 anaconda-ks.cfg

#如果修改主配置文件需要重啟服務
[root@client ~]# systemctl restart autofs

#一旦重啟atuofs服務,掛載dirname目錄屬于autofs服務管理,源數(shù)據(jù)不存在
[root@centos8 ~ ]# ll /opt/
total 0

#cd進入指定掛載點,autofs就會自動掛載
[root@client ~]# ls /opt/
[root@client ~]# cd /opt/nfs
[root@client nfs]# ls
passwd

[root@client nfs]# df -h | grep nfs
192.168.192.128:/nfs   62G  1.7G   61G    3% /opt/nfs

[root@client ~]# vim /etc/auto.master
/-     /etc/auto.master.d/auto.nfs

[root@client ~]# vim /etc/auto.master.d/auto.nfs
/opt/nfs     -fstype=nfs       192.168.192.128:/nfs

#autofs服務使用絕對路徑自動掛載，不會覆蓋原數(shù)據(jù)
[root@client ~]# systemctl start autofs
[root@client ~]# ll /opt/
總用量 4
-rw-------. 1 root root 1453 12月  5 04:03 anaconda-ks.cfg
drwxr-xr-x. 2 root root   20 12月  4 19:39 nfs

[root@client ~]# cd /opt/nfs/
[root@client nfs]# ls
passwd

[root@rhel82 ~]# yum install tuned -y

[root@rhel82 ~]# systemctl status tuned

[root@rhel82 ~]# tuned-adm active
Current active profile: virtual-guest

[root@rhel82 ~]# tuned-adm list
Available profiles:
- accelerator-performance     - Throughput performance based tuning with disabled higher latency STOP states
- balanced                    - General non-specialized tuned profile
- desktop                     - Optimize for the desktop use-case
- hpc-compute                 - Optimize for HPC compute workloads
- intel-sst                   - Configure for Intel Speed Select Base Frequency
- latency-performance         - Optimize for deterministic performance at the cost of increased power consumption
- network-latency             - Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network performance
- network-throughput          - Optimize for streaming network throughput, generally only necessary on older CPUs or 40G+ networks
- optimize-serial-console     - Optimize for serial console use.
- powersave                   - Optimize for low power consumption
- throughput-performance      - Broadly applicable tuning that provides excellent performance across a variety of common server workloads
- virtual-guest               - Optimize for running inside a virtual guest
- virtual-host                - Optimize for running KVM guests
Current active profile: virtual-guest

[root@rhel82 ~]# tuned-adm profile throughput-performance

[root@rhel82 ~]# tuned-adm active
Current active profile: throughput-performance

[root@rhel82 ~]# tuned-adm recommend
virtual-guest

[root@rhel82 ~]# tuned-adm profile virtual-guest

[root@rhel82 ~]# tuned-adm profile_info virtual-guest
Profile name:
virtual-guest

Profile summary:
Optimize for running inside a virtual guest

Profile description:

[root@rhel82 ~]# tuned-adm off

[root@rhel82 ~]# tuned-adm active
No current active profile.