wget https://download.redis.io/releases/redis-6.2.2.tar.gz
tar -xf redis-6.2.2.tar.gz
cd redis-6.2.2
make && make install
mkdir -p /etc/redis
cp redis.conf /etc/redis/6379.conf
cp utils/redis_init_script /etc/init.d/redis
chmod +x /etc/init.d/redis
systemctl enable redis 
systemctl start redis

查看防火墙某个端口是否开放

firewall-cmd --query-port=80/tcp

开放防火墙端口80

firewall-cmd --zone=public --add-port=80/tcp --permanent

关闭80端口

firewall-cmd --zone=public --remove-port=80/tcp --permanent  

- 阅读剩余部分 -

[root@centos8 ~]# wget https://mirrors.bfsu.edu.cn/apache/zookeeper/zookeeper-3.5.7/apache-zookeeper-3.5.7-bin.tar.gz
[root@centos8 ~]# tar -xf apache-zookeeper-3.5.7.tar.gz
[root@centos8 ~]# mv apache-zookeeper-3.5.7 /usr/local/zookeepr
[root@centos8 ~]# /usr/local/zookeeper/conf/
[root@centos8 ~]# mv zoo_sample.cfg zoo.cfg
[root@centos8 ~]# cd ../bin
[root@centos8 bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

如果启动失败，如下：

[root@centos8 bin]# ./zkServer.sh start
syncLimit=5
/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
syncLimit=5
Starting zookeeper ... FAILED TO START

看一下原因

[root@centos8 bin]# ./zkServer.sh start-foreground
/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain
Caused by: java.lang.ClassNotFoundException: org.apache.zookeeper.server.quorum.QuorumPeerMain

- 阅读剩余部分 -

配置全局生效

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

如果想改回默认，可以取消全局配置

composer config -g --unset repos.packagist

更多关于阿里镜像源信息，请访问阿里云 Composer 全量镜像