Linux 基础（三)
一、Linux中完整运行Django项目，前期准备
LNM+Python Django+uwsgi+redis项目
安装项目中需要的包：
pip3 install -i https://pypi.doubanio.com/simple/ -r re.txt
vim re.txt
asn1crypto==0.24.0
beautifulsoup4==4.6.3
bs4==0.0.1
certifi==2018.4.16
cffi==1.11.5
chardet==3.0.4
Click==7.0
cryptography==2.3.1
Django==1.11.9
Flask==1.0.2
Flask-Cors==3.0.6
gevent==1.3.6
greenlet==0.4.15
idna==2.7
ItsDangerous==1.1.0
Jinja2==2.10
lxml==4.2.6
MarkupSafe==1.0
numpy==1.15.3
Pillow==5.3.0
pycparser==2.18
PyMySQL==0.9.2
pytz==2018.7
requests==2.19.1
selenium==3.141.0
six==1.11.0
urllib3==1.23
virtualenv==16.1.0
Werkzeug==0.14.1
wordcloud==1.5.0
二、数据库的处理
（1）上传 bbs.sql （项目的数据库sql文件）
（2）在mysql中创建bbs库，并导入数据库SQL脚本
create database bbs charset utf8mb4;
use bbs;
source /opt/bbs.sql;
drop database bbs;
（3）查看项目 settings.py 配置文件，修改以下两处
ALLOWED_HOSTS = ['*']
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'bbs',
'HOST': "10.0.0.100", # 改成自己虚拟机的IP
'USER': 'root',
'PASSWORD': '123',
'PORT': 3306,
}
}
（4）MySQL用户的定义
-
USERNAME@'白名单'
-
白名单：主机域IP地址
root@'localhost'
root@'10.0.0.110'
root@'10.0.0.%'
root@'10.0.0.0/255.255.240.0'
root@'10.0.0.5%'
root@'%'
# 所有权限
grant all
# 部分权限
grant select,update,insert
三、BBS项目部署
（1）配置 nginx
vim /etc/nginx/conf.d/py.conf
server {
listen 80;
server_name 10.0.0.100;
client_max_body_size 100M;
location /static {
alias /opt/BBS/static/;
}
location /media {
alias /opt/BBS/media;
}
location / {
index index.html;
include uwsgi_params;
uwsgi_pass 127.0.0.1:9090;
uwsgi_param UWSGI_SCRIPT BBS.wsgi;
uwsgi_param UWSGI_CHDIR /opt/BBS;
}
}
（2）配置uwsgi
# 关闭所有已有的uwsgi进程
kill -9 `ps -ef |grep uwsgi|awk {'print $2'}`
# 配置uwsgi
vim uwsgi.ini
[uwsgi]
socket = 127.0.0.1:9090
master = true
workers = 2
reload-mercy = 10
vacuum = true
max-requests = 1000
limit-as = 512
buffer-size = 30000
# 启动uwsgi
uwsgi --ini uwsgi.ini &
# 重启nginx
systemctl restart nginx
四、Python 在运维工作中的经典应用
-- ansible
（1）安装ansible
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum install ansible -y
# 克隆虚拟机
hostnamectl set-hostname standby
# 编辑配置文件
vim /etc/sysconfig/network-scripts/ifcfg-eth0
# 修改IP
IPADDR=10.0.0.200
# 将UUID这行删掉
vim /etc/hosts
# 添加以下一行 到 /etc/hosts
10.0.0.200 虚拟机名
systemctl restart network
补充：
Linux的 SSHD(22)
验证方式:
(1)用户+密码(PAM)
(2)秘钥验证(公钥:钥匙和私钥:锁)
通过秘钥对实现,需要将公钥分发到各节点
（2）管理被控端，管理机先生成秘钥，然后推送公钥
ssh-keygen
ssh-copy-id -i ~/.ssh/id_rsa.pub root@10.0.0.200
# 批量推送公钥
for i in {1..12};do ssh-copy-id -i ~/.ssh/id_rsa.pub root@10.0.0.$i;done
（3）配置被管理的主机清单
vim /etc/ansible/hosts
[web]
10.0.0.100
10.0.0.200
（4）使用ansible的ad-hoc测试
ansible all -m ping
# ping以下，成功如下
10.0.0.12 | SUCCESS => {
"changed": false,
"ping": "pong"
}
10.0.0.11 | SUCCESS => {
"changed": false,
"ping": "pong"
}
（5）ansible playbook自动化安装nginx
vim playbook_nginx.yml
- hosts: web
remote_user: root
vars:
http_port: 80
tasks:
- name: Add Nginx Yum Repository
yum_repository:
name: nginx
description: Nginx Repository
baseurl: http://nginx.org/packages/centos/7/$basearch/
gpgcheck: no
- name: Install Nginx Server
yum:
name=nginx state=present
- name: Configure Nginx Server
template: src=./default.conf.template dest=/etc/nginx/conf.d/default.conf
notify: Restart Nginx Server
- name: Start Nginx Server
service: name=nginx state=started enabled=yes
handlers:
- name: Restart Nginx Server
service: name=nginx state=restarted
（6）default.conf.template文件如下
vim default.conf.template
server {
listen {{ http_port }};
server_name localhost;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
}
（7）执行ansible-playbook
# 检查语法
ansible-playbook --syntax playbook_nginx.yml
# 模拟执行
ansible-playbook -C playbook_nginx.yml
# 执行
ansible-playbook playbook_nginx.yml
五、Docker 容器技术
（1）环境准备类
curl http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum list docker-ce.x86_64 --showduplicates | sort -r
yum install -y --setopt=obsoletes=0 \
docker-ce-17.03.2.ce-1.el7.centos.x86_64 \
docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch
systemctl daemon-reload
systemctl restart docker
docker version
docker info
# 配置镜像加速
# 阿里云Docker-hub
https://cr.console.aliyun.com/cn-hangzhou/mirrors
mkdir -p /etc/docker
tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://68rmyzg7.mirror.aliyuncs.com"]
}
EOF
# 或者:
vim /etc/docker/daemon.json
{
"registry-mirrors": ["https://68rmyzg7.mirror.aliyuncs.com"]
}
（2）pull 常用镜像
docker pull centos:6.9
docker pull centos:7.5.1804
docker pull nginx
