Ubuntu 扩容 lvm
lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
测试硬盘灯
time dd if=/dev/sdb of=/dev/null bs=4k
for i in `lsblk |grep -w sd[a-z] |grep T |awk '{print $1}'`
do
nohup dd if=/dev/$i of=/dev/null bs=4k > /tmp/${i}.log &
done
CPU 高压测试
for i in `seq 1 30`; do dd if=/dev/zero of=/dev/null & done
ps -ef |grep -v grep|grep 'dd if=/dev/zero of=/dev/null'|awk '{print $2}'|xargs kill -9
top
Cpu(s): 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
id 前面数值是空闲率
ip 排序
sort -t . -k 4,4n tt
sort -t'.' -k1,1n -k2,2n -k3,3n -k4,4n
mdadm 软 raid
mdadm -C /dev/md1 -l raid0 -n 2 /dev/nvme2n2 /dev/nvme3n1
dpkg-error
dpkg: error processing package
mv /var/lib/dpkg/info /var/lib/dpkg/info.bak
mkdir /var/lib/dpkg/info
apt update
apt install sl
mv /var/lib/dpkg/info /var/lib/dpkg/info.ori
mv /var/lib/dpkg/info.bak /var/lib/dpkg/info
apt install lrzsz
CPU 温度查看
apt-get install lm-sensors sensors-applet -y
yes| sensors-detect
cat /sys/class/hwmon/hwmon0/device/hwmon/hwmon0/temp1_input
sensors
无交互修改密码
echo "root:test123."|chpasswd
开启 yum 缓存
vim /etc/yum.conf
#修改为1
keepcache=1
#默认存放目录在/var/cache
find 找出的移动或删除
find ./ -name 'means'|xargs -i mv {} /k-means/
find ./ -name 'means'|xargs -i cp {} /k-means/
#找出小于90G的文件
find ./ -type f -size -90G
-bash 错误修复
-bash-4.2$
cp /etc/skel/.bashrc /home/user/
cp /etc/skel/.bash_profile /home/user
useradd
设置免密
ssh-keygen -f ~/.ssh/id_rsa -P '' -q
sshpass -p123456
ssh-copy-id -f -i ~/.ssh/id_rsa.pub "-o StrictHostKeyChecking=no" 10.0.0.100
rpm 管理命令
rpm -ql nginx #列出所有相关目录
rpm -qc nginx #列出配置目录
rpm -e nginx #单独卸载
输出格式化整理
自动补全命令
yum install bash-completion #自动补全命令
VMware 相关
#VM安装linux在docker中装mysql挂起再启动后无法连接解决方法
vim /usr/lib/sysctl.d/00-system.conf
net.ipv4.ip_forward = 1
#重启网络服务
systemctl restart network
#查看IPv4转发状态
sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1
history 设置
历史命令显示时间
#写入/etc/bashrc或者/etc/profile
HISTFILESIZE=4000 #默认保存命令是1000条，这里修改为4000条
HISTSIZE=4000
USER_IP=`who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g'` #取得登录客户端的IP
if [ -z $USER_IP ]
then
USER_IP=`hostname`
fi
HISTTIMEFORMAT="%F %T $USER_IP:`whoami` " #设置新的显示history的格式
export HISTTIMEFORMAT
. /etc/bashrc
记录用户 bash
#####记录用户bash######################################################
history
USER=`whoami`
USER_IP=`who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g'`
if [ "$USER_IP" = "" ]; then
USER_IP=`hostname`
fi
if [ ! -d /var/log/history ]; then
mkdir /var/log/history
chmod 777 /var/log/history
fi
if [ ! -d /var/log/history/${LOGNAME} ]; then
mkdir /var/log/history/${LOGNAME}
chmod 300 /var/log/history/${LOGNAME}
fi
export HISTSIZE=4096
DT=`date +"%Y%m%d_%H:%M:%S"`
export HISTFILE="/var/log/history/${LOGNAME}/${USER}@${USER_IP}_$DT"
chmod 600 /var/log/history/${LOGNAME}/*history* 2>/dev/null
#######################################################################
vim 设置
#TAB 键为四个空格 永久显示行号
vim /etc/vimrc
set ts=4
set sw=4
set number
分区扩容
umount /data/
fdisk /dev/vdb
d
n
p
w
e2fsck -f /dev/vdb1
resize2fs /dev/vdb1
mount /dev/vdb1 /data/
df -h
cd /data/
ls
随机数生成
tcpdump 使用
时间同步
#如果不是北京时间先改成北京时间
1.删除自带的localtime
rm -rf /etc/localtime
2.创建软链接到localtime
ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
#同步阿里云
ntpdate ntp.aliyun.com
#写入硬件主板
hwclock -w
终端颜色
#写入到环境变量内
RED:
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31;40m\]\u\[\033[00;00;40m\]@\[\033[01;31;40m\]\h\[\033[00;31;40m\]:\[\033[00;00;40m\]\w \[\033[01;32;40m\]\$ \[\033[01;37;40m\]'
YELLOW:
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;33;40m\]\u\[\033[00;00;40m\]@\[\033[01;33;40m\]\h\[\033[00;33;40m\]:\[\033[00;00;40m\]\w \[\033[01;32;40m\]\$ \[\033[01;37;40m\]'
linux 格式问题
#检查文件格式，如果带M即是Windows，需要使用dosunix转换
cat -v filename
apt install dosunix -y
yum install dosunix -y
dos2unix filename
参考：
https://www.cnblogs.com/chuyiwang/p/13823551.html
文件分割
hexo 插件
npm install hexo-generator-searchdb --save
npm install hexo-deployer-git --save
npm install hexo-generator-cname
npm install hexo-generator-search --save
npm install hexo-abbrlink --save