查看centos7设备管理 centos7怎么看硬件配置

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mob64ca13f7ecc9 2024-03-17 19:14:44

文章标签 查看centos7设备管理 linux centos bash docker 文章分类 架构后端开发

部署项目

查看机器与系统信息
基本的安装与配置工作
为安装 Docker 和 K8s 做配置
安装 Docker
安装 K8s

Master
Node
Registry

安装 Mysql 8.0
安装 JAVA
安装 kafka

安装与配置 Zookeeper
安装与配置 kafka
kafka 常用命令
重置kafka
kafka 可视化

安装 Redis

单机安装 Redis
安装 Redis-Cluster （3主3从）

安装 Git

查看机器与系统信息

1、查看系统信息：

Linux版本：cat /etc/redhat-release
内核版本：cat /proc/version

2、查看内存、硬盘、CPU 信息

# 硬盘
df -h

# 内存
free -h

# 网卡信息（IP 、MAC），需要先 yum install -y net-tools
ifconfig

# cpu信息
cat /proc/cpuinfo 
cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c # cpu型号
cat /proc/cpuinfo | grep "physical id" | sort | uniq|wc -l # 物理cpu个数
cat /proc/cpuinfo | grep "processor" |wc -l # 逻辑cpu个数
cat /proc/cpuinfo | grep "cores"|uniq # cpu核数

基本的安装与配置工作

3、安装 wget gcc lsof net-tools vim

yum -y install wget gcc lsof net-tools vim

4、yum 换源

yum repolist

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

yum clean all && yum makecache && yum repolist

5、安装 Anaconda3（python环境）

mkdir -p /usr/software && cd /usr/software

wget https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/Anaconda3-2021.05-Linux-x86_64.sh


# bash命令执行安装脚本
bash Anaconda3-2021.05-Linux-x86_64.sh

echo 'export PATH="/root/anaconda3/bin:$PATH"' >> /etc/profile
source  /etc/profile

# pip 换国内源
mkdir  ~/.pip
vim  ~/.pip/pip.conf 

# 编辑
[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host = https://pypi.tuna.tsinghua.edu.cn
# 保存

7、时间与时区设置

（1）命令验证

# 显示的是 Local time
date 
# Fri Dec 18 01:20:50 CST 2020

timedatectl

# 显示如下
**************************************************
      Local time: Mon 2021-02-01 14:28:52 CST
  Universal time: Mon 2021-02-01 06:28:52 UTC
        RTC time: Mon 2021-02-01 06:28:52
       Time zone: Asia/Shanghai (CST, +0800)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a
**************************************************

正常的时间与时区显示：

Local time 是本地时间（北京时间），且使用的是 CST

Universal time 和 RTC time 比北京时间早8小时

Time zone 是 Asia/Shanghai +8

（2）python验证

import time
import datetime
time.time()
datetime.datetime.now()

（3）如果只是时区不对，则设置时区

timedatectl  set-timezone Asia/Shanghai

（4）调整时间同步

yum install -y chrony && systemctl enable --now chronyd

（5) ntp 调整时间同步

yum -y install ntp
sudo systemctl start ntpd
sudo systemctl enable ntpd

8、安装tmux

yum install http://galaxy4.net/repo/galaxy4-release-7-current.noarch.rpm
yum install tmux
tmux -V

为安装 Docker 和 K8s 做配置

hostnamectl set-hostname k8s-173

echo "192.168.10.203 k8s-173" >> /etc/hosts

systemctl status firewalld.service 
systemctl stop firewalld.service
systemctl disable firewalld.service

swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab
# sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
free -h

sestatus 
setenforce 0
sed -i "s/^SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
# sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

sestatus 

reboot
# 需要重启生效

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

# 开放端口 6443 2379-2380 10250 10251 10252 30000-32767

# 查看网卡配置是否正确，否则修改配置并重启网卡使生效
cat /etc/sysconfig/network-scripts/ifcfg-enp0s3

安装 Docker

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum -y update
yum list docker-ce --showduplicates | sort -r
yum install -y docker-ce docker-ce-cli containerd.io
docker version

mkdir -p /etc/docker && cd /etc/docker

vim daemon.json

{
    "registry-mirrors": ["https://xxxxxx.mirror.aliyuncs.com"],
	"insecure-registries": ["120.xxx.xx.189:5000"],
	"exec-opts": ["native.cgroupdriver=systemd"],
	"storage-driver": "overlay2",
    "storage-opts": [
    "overlay2.override_kernel_check=true"
  ],
	"log-driver": "json-file",
	"log-opts": {
		"max-size": "10m",
		"max-file": "1"
	}

}

# 保存

vim /lib/systemd/system/docker.service

# 第14行，修改
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --default-ulimit core=0:0

systemctl daemon-reload
systemctl restart docker
systemctl status docker
systemctl enable docker

docker info
systemctl status docker -l

# 如果启动失败
systemctl status docker.service
journalctl -xe

安装 K8s

ceph 、rancher、harbor

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

yum install -y kubectl kubelet kubeadm

kubelet --version
kubeadm version
kubectl version --client

systemctl enable kubelet && systemctl start kubelet

# 如有必要则需要修改 kubelet 使用的 cgroup 驱动程序
# 修改 /etc/sysconfig/kubelet
# KUBELET_EXTRA_ARGS=--cgroup-driver=<value>
# 由于我们已经在 docker 的 daemon.json 把 docker 的 cgroup 驱动配置为 与 k8s 默认的一致，因此这一步不需要

Master

kubeadm config images list
# 或者
kubeadm config images list --kubernetes-version=v1.20.2


kubeadm init --kubernetes-version=1.20.2  \
--apiserver-advertise-address=192.168.10.147   \
--image-repository registry.aliyuncs.com/google_containers  \
--pod-network-cidr=172.16.0.0/16

# 初始化结果
*************************************************************
Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.10.147:6443 --token vl3f6v.bvjochg4yudditaw \
    --discovery-token-ca-cert-hash sha256:xxx 
*************************************************************

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

yum install bash-completion -y
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)

kubectl get node
# or
kubectl get node -o wide

mkdir -p /usr/ezrealer_conf
wget https://docs.projectcalico.org/manifests/calico.yaml
vim calico.yaml

# 从末尾查带192的，并修改
?172

- name: CALICO_IPV4POOL_CIDR
   value: "172.16.0.0/16"
# 保存
kubectl apply -f calico.yaml

# Pods 的 Status变为Ready
kubectl get nodes

Node

在其他机器上执行 join 命令加入 k8s 集群

kubeadm token list # 查看现有 token
kubeadm token create # 过期（24h）的话，重新生成 token

# 查看 discovery-token-ca-cert-hash
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | \
   openssl dgst -sha256 -hex | sed 's/^.* //'


kubeadm join 192.168.10.147:6443 --token vl3f6v.bvjochg4yudditaw \
    --discovery-token-ca-cert-hash sha256:b6336c5016bfad9e5b4536fe3dce5247d9e804148b626795cdbe00517e3329b6

kubectl get node -o wide
kubectl get pod --all-namespaces
kubectl get pods --all-namespaces

Registry

docker pull registry
docker images
docker run -d -p 5000:5000 --name images_registry \
-v /usr/docker/ImagesRegistry:/var/lib/registry \
--restart=always registry:latest

docker ps
docker inspect images_registry | grep IPAddress
curl http://172.17.0.2:5000/v2/_catalog


# 需要其他机器的 daemon.json 配置     "insecure-registries" : [ "your-server-ip:5000" ] 
docker tag python:3.8 172.17.0.2:5000/python:3.8
docker push 172.17.0.2:5000/python:3.8
curl http://172.17.0.2:5000/v2/_catalog

docker pull 172.17.0.2:5000/python:3.8
docker images

curl http://172.17.0.2:5000/v2/_catalog
curl  http://172.17.0.2:5000/v2/python/tags/list
docker exec -it  registry sh -c 'cat /etc/docker/registry/config.yml'

Harbor https://ivanzz1001.github.io/records/post/docker/2018/04/20/docker-harbor-architecture

安装 Mysql 8.0

yum localinstall https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm

yum module disable mysql

yum -y update

yum -y install mysql-community-server

vim /etc/my.cnf

# Setted by Ezrealer (Ezrealer@qq.com)
port=18759

character-set-server = utf8mb4

collation-server = utf8mb4_general_ci

bind-address = 0.0.0.0

#只能用IP地址检查客户端的登录，不用主机名
skip_name_resolve = 1


default-time_zone='+8:00'

innodb_buffer_pool_size = 8G
thread_cache_size = 64
innodb_log_file_size = 4G

max_connections = 2000
interactive_timeout = 1800
wait_timeout = 1800

# expire_logs_days = 7 即将废弃
binlog_expire_logs_seconds

# 保存

systemctl start mysqld.service  

systemctl status mysqld.service

grep "password" /var/log/mysqld.log

mysql -uroot -p password

ALTER USER 'root'@'localhost' IDENTIFIED BY 'mypasswd';

use mysql;

update user set host='%' where user='root';

FLUSH PRIVILEGES;

ALTER USER 'root'@'%' IDENTIFIED BY 'mypasswd' PASSWORD EXPIRE NEVER;

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'mypasswd';

FLUSH PRIVILEGES;

exit;

# 查看服务日志
cat /var/log/mysqld.log

安装 JAVA

cd /usr/software
# wget https://repo.huaweicloud.com/java/jdk/13+33/jdk-13_linux-x64_bin.tar.gz
wget https://repo.huaweicloud.com/java/jdk/8u151-b12/jdk-8u151-linux-x64.tar.gz
tar -zxvf jdk-8u151-linux-x64.tar.gz -C /usr/local/
cd /usr/local
mv jdk1.8.0_151 jdk1.8
vim /etc/profile

export JAVA_HOME=/usr/local/jdk1.8
CLASSPATH=$JAVA_HOME/lib/
PATH=$PATH:$JAVA_HOME/bin
export PATH JAVA_HOME CLASSPATH
# 保存
source /etc/profile
java -version

安装 kafka

安装与配置 Zookeeper

mkdir /usr/software
cd /usr/software
wget https://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.6.3/apache-zookeeper-3.6.3-bin.tar.gz
tar -zxvf apache-zookeeper-3.6.3-bin.tar.gz -C /usr/local/
cd /usr/local/
mv apache-zookeeper-3.6.3-bin/ zookeeper-3.6.3
cd /usr/local/zookeeper-3.6.3/conf/
cp zoo_sample.cfg zoo.cfg

vim zoo.cfg

clientPort=2181
dataDir=/usr/local/zookeeper-3.6.3/data
dataLogDir=/usr/local/zookeeper-3.6.3/logs

server.1=192.168.10.48:2888:3888
server.2=192.168.10.49:2888:3888
server.3=192.168.10.50:2888:3888
# 保存

mkdir /usr/local/zookeeper-3.6.3/data
mkdir /usr/local/zookeeper-3.6.3/logs


scp -r /usr/local/zookeeper-3.6.3/ root@ip:/usr/local/zookeeper-3.6.3/

echo "1" > /usr/local/zookeeper-3.6.3/data/myid
echo "2" > /usr/local/zookeeper-3.6.3/data/myid
echo "3" > /usr/local/zookeeper-3.6.3/data/myid

cd /usr/local/zookeeper-3.6.3/bin
./zkServer.sh start

tail -f zookeeper.out
./zkServer.sh status
./zkServer.sh restart

./zkCli.sh -server localhost:12999

cd /usr/local/zookeeper-3.6.3/bin
ls path
get path
stat path
delete /nodename

./zkServer.sh stop
./zkServer.sh restart

安装与配置 kafka

1、安装

cd /usr/software
wget http://mirrors.hust.edu.cn/apache/kafka/2.7.0/kafka_2.13-2.7.0.tgz
tar -zxvf kafka_2.13-2.7.0.tgz -C /usr/local/

2、配置

jvm

cd /usr/local/kafka_2.13-2.7.0/bin
vim kafka-server-start.sh

# Generic jvm settings you want to add
if [ -z "$KAFKA_OPTS" ]; then
  KAFKA_OPTS="-Xmx8g -Xms8g -XX:MetaspaceSize=128m -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M -XX:MinMetaspaceFreeRatio=50
 -XX:MaxMetaspaceFreeRatio=85"
fi

server.conf

cd /usr/local/kafka_2.13-2.7.0/config

vim server.properties

broker.id=0
listeners=PLAINTEXT://0.0.0.0:9096
advertised.listeners=PLAINTEXT://120.xxx.xx.xxx:9096
num.network.threads=8
num.io.threads=16

log.dirs=/usr/local/kafka_2.13-2.7.0/logs
num.partitions=6
log.retention.hours=168
zookeeper.connect=192.168.10.48:2181,192.168.10.49:2181,192.168.10.50:2181

socket.send.buffer.bytes=1048576
socket.receive.buffer.bytes=1048576
delete.topic.enable=true
message.max.bytes=7340032
auto.create.topics.enable=false
# 保存
mkdir /usr/local/kafka_2.13-2.7.0/logs

scp -r /usr/local/kafka_2.13-2.7.0/ root@ip:/usr/local/kafka_2.13-2.7.0/

3、启动

./kafka-server-start.sh ../config/server.properties
./kafka-server-start.sh -daemon ../config/server.properties
./kafka-server-stop.sh  
ps -ef|grep Kafka|awk '{print $2}'|xargs kill -9

./kafka-topics.sh --create --zookeeper localhost:2121 --replication-factor 1 --partitions 1 --topic ezrealer
./kafka-topics.sh --list --zookeeper localhost:2121    
./kafka-console-producer.sh --broker-list localhost:9292 --topic ezrealer
./kafka-console-consumer.sh --bootstrap-server localhost:9292 --topic ezrealer --from-beginning

4、producer 与 consumer 的配置

producer

buffer.memory 67108864
batch.size  10485760
max.request.size=6291456
linger.ms 100 
max.request.size
Compression.type
acks 1
retries 10	
retry.backoff.ms 500 (重试间隔）

consumer

session.timeout.ms = 10s
heartbeat.interval.ms = 3s
max.poll.records 单次 call 的数据返回量
max.poll.interval.ms 默认是 5 分钟。如果5分钟内无法消费完 poll 方法返回的消息，那么消费者会自动离组。
fetch.message.max.bytes  8388608
max.partition.fetch.bytes 8388608

kafka 常用命令

1、创建、查看与修改主题

./kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 2 --partitions 4 --topic test
./kafka-topics.sh --zookeeper 127.0.0.1:2181 --list
./kafka-topics.sh --describe --zookeeper zk:2181 --topic topicName
./kafka-topics.sh --zookeeper zk:2181 -topic topicName --alter --config retention.ms=2678400000

2、查看消费者消费情况

./kafka-consumer-groups.sh --bootstrap-server localhost:9096 --describe --group my_consumer_group

3、查看主题的数据量

./kafka-run-class.sh kafka.tools.GetOffsetShell --broker-list localhost:9096 -topic tbl_stream_16432 --time -1

4、删除主题

./kafka-topics.sh --zookeeper localhost:2181 --delete --topic test

重置kafka

1、停止 kafka 服务，并删掉 kafka 中的 topic 数据

cd /kafka_2.11-1.1.0/bin
./kafka-server-stop.sh
# 或
ps -ef|grep Kafka|awk '{print $2}'|xargs kill -9

# 删除kafka 全部 topic 的数据目录；
# （server.properties文件log.dirs配置，默认为“/tmp/kafka-logs”）
cd /kafka_2.11-1.1.0/data
rm -r *

2、删掉 zookeeper 中 kafka 相关数据，并重启 zookeeper

cd /zookeeper-3.4.13/bin/
./zkCli.sh
ls /
rmr /brokers
rmr /consumers

./zkServer.sh restart

3、启动kafka

# 启动kafka
./kafka-server-start.sh ../config/server.properties

# 后台启动kafka
nohup ./kafka-server-start.sh ../config/server.properties 1>/dev/null 2>&1 &

kafka 可视化

cd /usr/software
wget https://github.com/yahoo/CMAK/archive/3.0.0.5.tar.gz
tar -zxvf 3.0.0.5.tar.gz -C /usr/local/
cd /usr/local/CMAK-3.0.0.5
curl https://bintray.com/sbt/rpm/rpm | sudo tee /etc/yum.repos.d/bintray-sbt-rpm.repo
yum install sbt
sbt clean dist

# 如果很慢，可以
cd ~/.sbt/
vim repositories

[repositories]
#local
public: http://maven.aliyun.com/nexus/content/groups/public/
typesafe:http://dl.bintray.com/typesafe/ivy-releases/ , [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext], bootOnly
ivy-sbt-plugin:http://dl.bintray.com/sbt/sbt-plugin-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
sonatype-oss-releases

sonatype-oss-snapshots

# 保存

cd /usr/local/CMAK-3.0.0.5/conf
vim application.conf

安装 Redis

单机安装 Redis

1、安装

cd /usr/software
wget https://download.redis.io/releases/redis-6.2.1.tar.gz
tar -zxvf redis-6.2.1.tar.gz -C /usr/local/
cd /usr/local/redis-6.2.1
make

# 如果gcc 版本低于 5.3，此处会报错，Centos7 默认的 gcc版本是4.8
gcc -v
yum -y install centos-release-scl
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
source /opt/rh/devtoolset-9/enable
echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile
gcc -v
make distclean

make
# make install PREFIX=/usr/local/redis-6.0.10 # 将可执行文件安装至指定的目录下
make test

2、配置与启动

vim redis.conf

bind 127.0.0.1 内网IP 外网IP
protected-mode no
port 17197
tcp-backlog 2048
timeout 900
daemonize yes
pidfile "redis_17197.pid"
logfile "redis_17197.log"
save 86400 1
stop-writes-on-bgsave-error no
rdbcompression no
rdbchecksum no
requirepass mypasswd
maxmemory 64gb
maxclients 100000

io-threads 4

io-threads-do-reads no # 因为原作者认为读多线程的效果一般般
# 保存

# 启动
cd src
./redis-server ../redis.conf

# 关闭
./redis-cli -h 0.0.0.0 -p 17197 -a mypasswd shutdown

3、做成系统服务启动

cd /usr/local/redis-6.2.1/utils
vim systemd-redis_server.service


cp systemd-redis_server.service /usr/lib/systemd/system/redis.service
chmod 754 /usr/lib/systemd/system/redis.service
systemctl daemon-reload && systemctl enable redis.service && systemctl start redis.service && systemctl status redis.service

安装 Redis-Cluster （3主3从）

1、在三台机器（172，174，175）分别执行上面的安装步骤

2、配置（以172为例）

cd /usr/local/redis-6.2.1

mkdir redis_17197
mkdir redis_17198

vim redis.conf

# 集群相关配置
port 17197
dir /usr/local/redis-6.2.1/redis_17197 # log 和 dump备份等都放入这里
logfile redis_17197_log.txt
dbfilename dump_17197.rdb
pidfile /usr/local/redis-6.2.1/redis_17197/17197.pid
cluster-enabled yes
cluster-config-file nodes-17197.conf
cluster-node-timeout 15000
masterauth mypasswd

bind 0.0.0.0
protected-mode no
tcp-backlog 2048
timeout 1800
daemonize yes

save 86400 1
stop-writes-on-bgsave-error no
rdbcompression no
rdbchecksum no
requirepass mypasswd
maxmemory 64gb

io-threads 4

io-threads-do-reads no
# 保存

mv redis.conf ./redis_17197/

3、替换配置文件的端口，生成新的文件

cd /usr/local/redis-6.2.1/redis_17197
sed 's/17197/17198/g' ./redis.conf > ../redis_17198/redis.conf

4、在其他两台机器也做同样的配置

5、创建集群

系统自动给每个机器的17197端口的节点设为主节点，17198端口的节点设置为其他机器的从节点，非常合理！

./redis-cli --cluster create 192.168.3.172:17197 192.168.3.172:17198 192.168.3.173:17197 192.168.3.173:17198 192.168.3.175:17197 192.168.3.175:17198 --cluster-replicas 1 -a mypasswd

# 出现每个节点是主从分配和 16384 个槽位的分配， 输入yes确定
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.3.174:17198 to 192.168.3.172:17197
Adding replica 192.168.3.175:17198 to 192.168.3.174:17197
Adding replica 192.168.3.172:17198 to 192.168.3.175:17197

yes

[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

6、登录与验证集群

./redis-cli -c -h  192.168.3.172  -p 17197 
auth mypasswd
cluster nodes
cluster info
info

7、Python 操作 Redis 集群的 Demo

from rediscluster import RedisCluster

startup_nodes = [{'host': '192.168.3.172', 'port': 17197}, {'host': '192.168.3.172', 'port': 17198},
                        {'host': '192.168.3.174', 'port': 17197}, {'host': '192.168.3.174', 'port': 17198},
                        {'host': '192.168.3.175', 'port': 17197}, {'host': '192.168.3.175', 'port': 17198}]

rc = RedisCluster(startup_nodes=startup_nodes, decode_responses=True,password = 'mypasswd')

rc.set("foo", "bar")
print(rc.get("foo"))

8、Redis 集群的 key的设计

Redis Cluster 提供了一个 hash tag 的机制，可以让我们把一组 key 映射到同一个 slot。

例如：user1000.following 这个 key 保存用户 user1000 关注的用户；user1000.followers 保存用户 user1000 的粉丝。

这两个 key 有一个共同的部分 user1000，可以指定对这个共同的部分做 slot 映射计算，这样他们就可以在同一个槽中了

设计方式：{user1000}.following 和 {user1000}.followers

就是把共同的部分使用 { } 包起来，计算 slot 值时，如果发现了花括号，就会只对其中的部分进行计算。

Multi-Key 这一点是 Redis Cluster 对于我们日常使用中最大的限制，一定要注意，如果多key不在同一个 slot 中就会报错。

安装 Git

Git 下载网站：https://mirrors.edge.kernel.org/pub/software/scm/git/

whereis git

sudo yum install -y wget
sudo yum install -y gcc-c++
sudo yum install -y zlib-devel perl-ExtUtils-MakeMaker
sudo yum install curl-devel expat-devel gettext-devel openssl-devel zlib-develperl-devel

yum remove git

cd /usr/software
wget https://mirrors.edge.kernel.org/pub/software/scm/git/git-2.30.1.tar.gz

tar -zxvf cd git-2.30.1.tar.gz 

cd git-2.30.1

yum install install autoconf automake libtool

make configure

sudo make prefix=/usr/local/git install

echo 'export PATH=/usr/local/git/bin:$PATH' >> /etc/profile
source  /etc/profile

git --version

git config --global user.name "Ezrealer"

git config --global user.email Ezrealer@qq.com

git config --list

ssh-keygen -t rsa -C "Ezrealer@qq.com"

Enter > Enter > Enter 

# 输出
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.

# 查看公钥
cat /root/.ssh/id_rsa.pub

可将公钥设置到个人的 github 或者 gitee，并在服务器上拉取 gitee 上的项目

mkdir -p /usr/EzrealerGitRepo
cd /usr/EzrealerGitRepo
git clone git@gitee.com:Ezrealer/MyProgram.git
# 更新
git pull origin master

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