文章目录
监控100台服务器磁盘利用率脚本
1. df -h 查看磁盘占有
2. 远程连接
1. 远程连接生成sshkey
[root@localhost ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:oqRrNpiEGm/lvN6Nark2VQHckCk56Egda/RVeG1J+qc [email protected]
The key's randomart image is:
+---[RSA 2048]----+
| .+.ooBo.o.. |
| .o.* =.o..+ |
|.o o + .o. |
|. o . . |
|. . ..S . . |
|o. o.... o |
|o=.+.o E |
|+ *.B. o |
| +.===o . |
+----[SHA256]-----+
[root@localhost ~]#
2. 复制ssh公钥到目标服务器
[root@localhost ~]# ssh-copy-id [email protected]
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.43.228 (192.168.43.228)' can't be established.
ECDSA key fingerprint is SHA256:FXF2nnf+x1mP2M662486Z/51fjmcwfE23S2Pewwlxx8.
ECDSA key fingerprint is MD5:c0:cb:5f:3f:ba:3a:b4:2b:73:47:7b:59:d1:79:94:17.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
[email protected]'s password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.
3. 登录目标服务器查看
192.168.43.228
[root@localhost ~]# ls -a
. anaconda-ks.cfg .bash_profile .cshrc .tcshrc
.. .bash_logout .bashrc .ssh .viminfo
[root@localhost ~]# cd .ssh/
[root@localhost .ssh]# ll
total 4
-rw------- 1 root root 408 Feb 24 21:16 authorized_keys
[root@localhost .ssh]#
4. 私钥免登录
192.168.43.134 服务器通过私钥免交互登录目标服务器(192.168.43.228)
[root@localhost ~]# ssh -i .ssh/id_rsa [email protected]
Last login: Mon Feb 24 21:20:34 2020 from 192.168.43.134
[root@localhost ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.43.228 netmask 255.255.255.0 broadcast 192.168.43.255
inet6 fe80::2df:a3c9:3a0d:ed24 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:07:3f:59 txqueuelen 1000 (Ethernet)
RX packets 1602 bytes 151986 (148.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1035 bytes 140376 (137.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 296 bytes 54872 (53.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 296 bytes 54872 (53.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost ~]#
5. 192.168.43.134 服务器创建host,info文件
vim host.info
192.168.43.228 root 22
192.168.43.226 ly 22
192.168.43.225 user 22
6. 编辑脚本
#!/bin/bash
HOST_INFO=host.info
for IP in $(awk '/^[^#]/{print $1}' $HOST_INFO); do
USER=$(awk -v ip=$IP 'ip==$1{print $2}' $HOST_INFO)
PORT=$(awk -v ip=$IP 'ip==$1{print $3}' $HOST_INFO)
TMP_FILE=/tmp/disk.tmp
ssh -p $PORT $USER@$IP 'df -h' > $TMP_FILE
USE_RATE_LIST=$(awk 'BEGIN{OFS="="}/^\/dev/{print $NF,int($5)}' $TMP_FILE)
for USE_RATE in $USE_RATE_LIST; do
PART_NAME=${USE_RATE%=*}
USE_RATE=${USE_RATE#*=}
if [ $USE_RATE -ge 80 ]; then
echo -e "$IP /n Warning: $PART_NAME Partition usage $USE_RATE%!"
else
echo "SERVER OK!"
fi
done
done
7. 赋予可执行权限
chmod +x 6.sh
8. 运行脚本
[root@localhost app]# ./6.sh
SERVER OK!
SERVER OK!
SERVER OK!
9. 命令分解
[root@localhost ~]# df -h |awk '/^\/dev/{print $0}'
/dev/mapper/centos-root 50G 2.1G 48G 5% /
/dev/sda1 1014M 146M 869M 15% /boot
/dev/mapper/centos-home 47G 33M 47G 1% /home
vim host.info
192.168.43.228 root 22
192.168.43.226 ly 22
192.168.43.225 user 22
#$1 第1列
#$2 第2列
#$3 第3列
[root@localhost ~]# awk '/^[^#]/{print $1}' host.info
192.168.43.228
192.168.43.226
192.168.43.225
[root@localhost ~]# awk '/^[^#]/{print $2}' host.info
root
ly
user
[root@localhost ~]# awk '/^[^#]/{print $3}' host.info
22
22
22
[root@localhost ~]# awk -v ip=192.168.43.228 '$1==ip{print $2}' host.info root
