http://mirrors.163.com/centos/ https://www.centos.org/download/
linux系统为了安全将内存分用户区与内核区两大部分， 内核区域加载OS相关代码，不允许用户直接访问，提供了一系列接口， 外部设备，比如磁盘，音响，耳机都有驱动程序， 这些驱动程序可直接加载到内核中运行， 并告诉内核该如何运行这些设备
### gcc 安装 sudo yum -y install gcc gcc-c++ kernel-devel 对于 centos7，此命令安装的gcc版本是4.8.5 # gcc -dumpversion 4.8.5 ### gcc 升级-10 yum install centos-release-scl yum install devtoolset-10-gcc* /usr/bin/scl enable devtoolset-10 bash # gcc -dumpversion 10 ### gcc 升级-8 yum install centos-release-scl yum install devtoolset-8-gcc* /usr/bin/scl enable devtoolset-8 bash 其中下面这句话要加入服务器的启动项中，因为每次重启，GCC又会回到4.8.5;或者在编译文件时，重新手工执行 scl enable devtoolset-8 bash 或者将新安装的gcc通过软链接放到/bin下面 查看glibc版本 xt@xt:~$ ldd --version ldd (Ubuntu GLIBC 2.36-0ubuntu4) 2.36 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Written by Roland McGrath and Ulrich Drepper. glibc版本升级 ### gcc 升级-10 yum install centos-release-scl yum install devtoolset-10-gcc* /usr/bin/scl enable devtoolset-10 bash # gcc -dumpversion 10 $ ldd --version ldd (GNU libc) 2.17 Copyright (C) 2012 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Written by Roland McGrath and Ulrich Drepper. # 升级 make(默认为3 升级为4) [root@nd make-4.3]# make --version GNU Make 3.82 Built for x86_64-redhat-linux-gnu wget http://ftp.gnu.org/gnu/make/make-4.3.tar.gz tar -xzvf make-4.3.tar.gz && cd make-4.3/ ./configure --prefix=/usr/local/make make && make install cd /usr/bin/ && mv make make.bak ln -sv /usr/local/make/bin/make /usr/bin/make # make --version GNU Make 4.3 wget http://ftp.gnu.org/gnu/glibc/glibc-2.28.tar.gz tar xf glibc-2.28.tar.gz cd glibc-2.28/ && mkdir build && cd build make all yum whatprovides libstdc++.so.6 yum update -y libstdc++.x86_64 sudo wget http://www.vuln.cn/wp-content/uploads/2019/08/libstdc.so_.6.0.26.zip unzip libstdc.so_.6.0.26.zip cp libstdc++.so.6.0.26 /lib64/ cd /lib64 # 把原来的命令做备份 cp libstdc++.so.6 libstdc++.so.6.bak rm -f libstdc++.so.6 # 重新链接 ln -s libstdc++.so.6.0.26 libstdc++.so.6 cd glibc-2.28/build ../configure --prefix=/usr --disable-profile --enable-add-ons --with-headers=/usr/include --with-binutils=/usr/bin make make install |
sudo yum install centos-release-scl 安装所需版本的GCC（假设SCL仓库中有与7.3.0相近的版本，如devtoolset-7，实际使用时需替换为具体版本号）： sudo yum install devtoolset-7-gcc devtoolset-7-gcc-c++ 注意：由于SCL仓库中可能不包含GCC 7.3.0，因此你需要查找并安装最接近的版本。 scl enable devtoolset-7 bash echo 'source scl_source enable devtoolset-7' >> ~/.bashrc source ~/.bashrc 源码安装 sudo yum groupinstall "Development Tools" sudo yum install wget bzip2 gcc-c++ make wget https://ftp.gnu.org/gnu/gcc/gcc-7.3.0/gcc-7.3.0.tar.gz tar -xzvf gcc-7.3.0.tar.gz cd gcc-7.3.0 ./contrib/download_prerequisites 如果遇到下载问题，可以检查并修改脚本中的下载地址，然后重新执行脚本 mkdir build cd build ../configure --prefix=/usr/local/gcc-7.3.0 --enable-languages=c,c++ --disable-multilib make -j$(nproc) # nproc命令用于获取CPU的核数，以加速编译过程 sudo make install echo 'export PATH=/usr/local/gcc-7.3.0/bin:$PATH' >> ~/.bashrc source ~/.bashrc |
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Cannot find a valid baseurl for repo: base/7/x86_64
# cat /etc/resolv.conf # Generated by NetworkManager nameserver 192.168.228.41 nameserver 2409:8900:30e3:fc5::3e 改为 nameserver 8.8.8.8 这么改的确有用了，但原来不改的时候也执行成功过
离线包安装 rpm -qa | grep readline-devel rpm -qa | grep zlib-devel yum search readline-devel mkdir -p /opt/soft/pg/rpm_centos7 yum install --downloadonly --downloaddir=/opt/soft/rpm/ readline-devel.x86_64 rpm -Uvh --force --nodeps *.rpm
CentOS7开启SSH服务
yum install openssh-server vim /etc/ssh/sshd_config Port 22 #AddressFamily any ListenAddress 0.0.0.0 ListenAddress :: PermitRootLogin yes sudo service sshd start ps -e | grep sshd
windows免密登录centos7
centos7上执行，一路回车,如果执行过就不用执行了 ssh-keygen -t rsa windows上安装一个git,进入git bash 执行 ssh-keygen -t rsa cd /c/Users/ cd Administrator/ cd .ssh/ scp id_rsa.pub xt@192.168.56.104:/home/xt/.ssh/ 进入centos7 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys 授权600,只认这个权限 chmod -R 600 authorized_keys rm ~/.ssh/id_rsa.pub 登录测试 ssh xt@192.168.56.104
vim中文乱码
在/etc/vimrc文件最后追加 vim /etc/vimrc set fileencodings=utf-8,ucs-bom,gb18030,gbk,gb2312,cp936 set termencoding=utf-8 set encoding=utf-8
less查看中文乱码
在下面这种方式上切换一下 export LESSCHARSET=latin1 export LESSCHARSET=utf-8
命令行中文乱码
# locale LANG=en_US.UTF-8 LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= centos 6 yum groupinstall chinese-support centos 7 yum install kde-l10n-Chinese # vim /etc/sysconfig/i18n LANG="zh_CN.UTF-8" SYSFONT="latarcyrheb-sun16" reboot # locale LANG=zh_CN.UTF-8 LC_CTYPE="zh_CN.UTF-8" LC_NUMERIC="zh_CN.UTF-8" LC_TIME="zh_CN.UTF-8" LC_COLLATE="zh_CN.UTF-8" LC_MONETARY="zh_CN.UTF-8" LC_MESSAGES="zh_CN.UTF-8" LC_PAPER="zh_CN.UTF-8" LC_NAME="zh_CN.UTF-8" LC_ADDRESS="zh_CN.UTF-8" LC_TELEPHONE="zh_CN.UTF-8" LC_MEASUREMENT="zh_CN.UTF-8" LC_IDENTIFICATION="zh_CN.UTF-8"
crontab时间格式
分 时 天 周 月 */1 * * * * 每分钟 1 1 * * * 每天1点1分
开机启动
@reboot ( sleep 30 ; bash /opt/scripts/os_init.sh )
python添加脚本到crontab
from tempfile import NamedTemporaryFile
import os
def add_crontab(task):
with os.popen("crontab -l", "r") as pipe:
current = pipe.read()
current += task
with NamedTemporaryFile("w") as f:
f.write(current)
f.flush()
os.system(f"crontab {f.name}")
def clear_crontab():
with NamedTemporaryFile("w") as f:
f.write("\n")
f.flush()
os.system(f"crontab {f.name}")
def get_crontab():
with os.popen("crontab -l", "r") as pipe:
current = pipe.read()
print(current)
get_crontab()
file = "/opt/tpf/aiwks/code/aisty/test/crontab1/py_scripts.py &"
task1 = f"40 16 * * * /home/xt/anaconda3/bin/python {file}\n"
add_crontab(task1)
get_crontab()
crontab每分钟效果展示
脚本/opt/tpf/aiwks/code/aisty/test/crontab1/py_scripts.py
import os
import time
now =time.strftime("%H:%M:%S")
os.system(f"echo {now} >> /tmp/a.log")
任务计划
$ crontab -l
*/1 * * * * /home/xt/anaconda3/bin/python /opt/tpf/aiwks/code/aisty/test/crontab1/py_scripts.py &
结果输出
14:29:01
14:30:01
14:31:02
crontab每天效果展示
每天14点45分执行脚本 任务计划 $ crontab -l 45 14 * * * /home/xt/anaconda3/bin/python /opt/tpf/aiwks/code/aisty/test/crontab1/py_scripts.py & 结果输出 14:45:01
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时间同步
$ date
Sun Jun 25 01:41:52 CST 2023
$ sudo date -s "09:45:02"
Sun Jun 25 09:45:02 CST 2023
$ date
Sun Jun 25 09:46:56 CST 2023
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sudo vim /etc/timezone
Asia/Shanghai
sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
date
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