课程第31/32次
firewalld的富规则：
NAT:
firewall-cmd --permanent --add-masquerade
firewall-cmd --reload
DNAT:
firewall-cmd --permanent--add-rich-rule='rule family=ipv4 source address=192.168.0.0/24forward-port port=80 protocol=tcp to-port=80 to-addr=172.31.128.3'
firewall-cmd --reload
SELinux:
semanage fcontext -l
semanage boolean -l
semanage port -l
httpd.conf的端口改为82，
报以下的错误就是SELinux端口阻挡：
# systemctl restart httpd
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.
semanage port -a -t http_port_t-p tcp 82
----------------------------------------------------------
shell编程：
for i in * ; do du -s $i 2> /dev/null; done|sort -n------好习惯的例子-----
2.lib:
sub_du() {
read -p "PLS input the directory: " v_dir
(for i in ${v_dir}*
do
du -s $i 2>/dev/null
done) | sort -n
}
2.sh
#!/bin/sh
source/root/labs/2.lib
sub_du
-------------------------------------------
注意位置参数：
# cat 3.sh
echo $1 $2 $3 $4 $5 $6 $7 $8 $9 $10
# ./3.sh 1 2 3 4 5 6 7 8 9 a
1 2 3 4 5 6 7 8 9 10
# vim 3.sh
# cat 3.sh
echo $1 $2 $3 $4 $5 $6 $7 $8 $9 ${10}
# ./3.sh 1 2 3 4 5 6 7 8 9 a
1 2 3 4 5 6 7 8 9 a-------------------------关于整型数运算：
v_random=$[ $RANDOM$RANDOM$RANDOM$RANDOM$RANDOM$RANDOM$RANDOM$RANDOM% 30 + 1 ]
#echo $v_random
if [ $v_random -lt 0 ]
then
if [ $v_random -eq -30 ]
then
echo $[ 31 + $v_random ]
else
echo $[ 30 + $v_random ]
fi
else
echo $v_random
fi
--------关于浮点数
#!/bin/sh
read -p "Num1: " v_num1
read -p "Num2: " v_num2
bc <<EOF
scale=4
$v_num1 / $v_num2
EOF
-------不定循环次数
#!/bin/sh
while [ ! -f /root/labs/6.txt ]
do
sleep 1
done
cat /root/labs/6.txt-------------------------RH254P357
#!/bin/sh
sub_float() {
bc <<EOF
scale=3
( $1 / $2 ) * 100
EOF
}
v_fmt="--skip-column-names -E"
v_cmd='show databases'
v_backupdir="/dbbackup"
for i in $(mysql $v_fmt -u root -e "$v_cmd" | grep -v '^*' | grep -v information_schema | grep -v performance_schema)
do
echo "Backing up $i"
mysqldump -u root $i >$v_backupdir/${i}.dump
done
v_total=0
for i in $v_backupdir/*
do
v_size=$(stat --printf "%s\n" $i)
v_total=$[ $v_total + $v_size ]
done
for i in$v_backupdir/*
do
v_size=$(stat --printf "%s\n" $i)
echo "$i, $v_size,$(sub_float $v_size$v_total)%"
done# ./7.sh
Backing up mysql
Backing up test
/dbbackup/mysql.dump, 514664,99.700%
/dbbackup/test.dump, 1261,.200%
--------------------------------------------------------
以下是判断网络情况程序：
#!/bin/sh
rm -f /tmp/8.txt
for i in {1..254}
do
(ifping -c 2 -W 1 -q 192.168.0.$i > /dev/null 2>&1
then
echo 192.168.0.$i is online
fi) >> /tmp/8.txt &
done
wait
cat /tmp/8.txt
改写成：
sub_ping() {
rm -f /tmp/sub_ping.txt
for i in {1..254}
do
(ifping -c 8 -W 1 -q $SUBCON1.$i > /dev/null 2>&1
then
echo 192.168.0.$i is online
fi )>> /tmp/sub_ping.txt &
done
wait
sort -t . -k 4 -n /tmp/sub_ping.txt
}
# vim 8.lib
# cat 8.sh
#!/bin/sh
. /root/labs/8.lib
sub_ping
---------------------子程序的其他例子：
sub_answer() {
unset SUBANS
sub_sub_answer(){
SUBANS=`echo $SUBANS |tr -d "[:blank:]"`
if [ -z $SUBANS ]
then
SUBANS="NULL"
fi
}
read -p "$1" SUBANS
sub_sub_answer
until [ $SUBANS =="y"-o$SUBANS =="n" ]
do
echo "This question should be answered either with \"y\" or \"n\"."
read -p "$1" SUBANS
sub_sub_answer
done
}
#!/bin/sh
. /usr/lib/botang-func
sub_answer "Pls input: "
[ $SUBANS == "y" ] && echo "OK"----------------------------------
sub_confirm() {
unset SUBCON1
unset SUBCON2
SUBCON1=0
SUBCON2=1
until [ $SUBCON1 == $SUBCON2 ]
do
read -p "$1" SUBCON1
sub_answer "Input is: \"$SUBCON1\". Are you sure ?(y/n)"
if [ -z $SUBCON1 ]
then
SUBCON1="NULL"
fi
if [ $SUBANS == "y" ]
then
SUBCON2=$SUBCON1
fi
done
}
#!/bin/sh
../10.lib
sub_confirm "Pls input :"
echo "Your input is$SUBCON1"
显示红色：
sub_red() {
echo -e "\033[31;1m${1}\033[0m"
}
显示绿色：
sub_green() {
echo -e "\033[32;1m${1}\033[0m"
}显示红色闪烁：
sub_red_blink() {
echo -e "\033[31;5;1m${1}\033[0m"
}显示绿色闪烁：
sub_green_blink() {
echo -e "\033[32;5;1m${1}\033[0m"
}
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