1、搭建一个 redis 哨兵集群
准备三台主机，搭建一个一主两从的redis哨兵集群
10.0.0.7：主
10.0.0.212，10.0.0.215：从
1）、在三台主机上安装redis服务，修改redis配置文件，并配置主从关系，修改内容如下：
[root@localhost redis-5.0.9]#vim redis.conf
bind 0.0.0.0
daemonize yes
replicaof 10.0.0.207 6379
masterauth 123456
requirepass 123456
2）、启动redis服务，验证主从复制关系
127.0.0.1:6379> INFO replication
# Replication
role:master
connected_slaves:2
slave0:ip=10.0.0.212,port=6379,state=online,offset=1904,lag=1
slave1:ip=10.0.0.215,port=6379,state=online,offset=1904,lag=1
master_replid:70ea5f1e36b836b5d2fec6e347425a1fbad9ea91
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1904
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1904
3）、修改sentinel配置信息，启动redis-sentinel服务开启哨兵模式
[root@localhost redis-5.0.9]#vim sentinel.conf
daemonize yes
sentinel monitor mymaster 10.0.0.207 6379 2
sentinel auth-pass mymaster 123456
4）、关闭主10.0.0.207上的redis服务，sentinel重新选举了10.0.0.212为主
127.0.0.1:6379> INFO replication
# Replication
role:master
connected_slaves:2
slave0:ip=10.0.0.215,port=6379,state=online,offset=183879,lag=0
slave1:ip=10.0.0.207,port=6379,state=online,offset=183744,lag=1
master_replid:4ad939b7eb8f47c5748e212c80aa82f2b2110d33
master_replid2:1d4108364b87d6baeb20c24ebf767301a08c3650
master_repl_offset:183879
second_repl_offset:174044
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:183879
2、实现 redis cluster 的部署
准备6台主机，搭建基于redis5版本的cluster集群
6台主机地址：10.0.0.202 10.0.0.207 10.0.0.212 10.0.0.214 10.0.0.215 10.0.0.216
1）、6台主机都安装redis服务，版本都为5
dnf -y install redis
2）、修改每个节点的redis配置文件，开启cluster功能，修改内容如下：
[root@localhost ~]#vim redis.conf
bind 0.0.0.0
masterauth 123456
requirepass 123456
cluster-enabled yes
cluster-config-file nodes-6379.conf
cluster-require-full-coverage no
3）、创建集群
[root@localhost ~]#redis-cli -a 123456 --cluster create 10.0.0.202:6379 10.0.0.207:6379 10.0.0.212:6379 10.0.0.214:6379 10.0.0.215:6379 10.0.0.216:6379 --cluster-replicas 1
4）、验证集群状态
[root@localhost ~]#redis-cli -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> CLUSTER INFO
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:6
cluster_size:3
cluster_current_epoch:6
cluster_my_epoch:1
cluster_stats_messages_ping_sent:197
cluster_stats_messages_pong_sent:177
cluster_stats_messages_meet_sent:5
cluster_stats_messages_sent:379
cluster_stats_messages_ping_received:177
cluster_stats_messages_pong_received:202
cluster_stats_messages_received:379
5）、查看集群节点主从对应关系
[root@localhost ~]#redis-cli -a 123456 CLUSTER NODES
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
589dd0c73e46429a7de414bed35b623da5791bda 10.0.0.212:6379@16379 master - 0 1603959305436 3 connected 10923-16383
0dff98d3b4543090850b95794a784393140d58f1 10.0.0.215:6379@16379 slave bfa48a7ce412e9baa13b29fa08184ed8dfd8a549 0 1603959304000 1 connected
62f19caaf36d5a72be447d3ea57290652316eae4 10.0.0.214:6379@16379 myself,slave 589dd0c73e46429a7de414bed35b623da5791bda 0 1603959306000 4 connected
39a90696c56ef9ce40f94966755eba0edd788ec5 10.0.0.216:6379@16379 slave 594da0691cd90e761970c06ed77e1b520c88f2df 0 1603959302414 6 connected
594da0691cd90e761970c06ed77e1b520c88f2df 10.0.0.207:6379@16379 master - 0 1603959304429 2 connected 5461-10922
bfa48a7ce412e9baa13b29fa08184ed8dfd8a549 10.0.0.202:6379@16379 master - 0 1603959306443 1 connected 0-5460
3、部署一个 tomcat 服务
1）、首先安装java开发工具包openjdk
[root@localhost ~]#yum -y install java-1.8.0-openjdk.x86_64
2）、二进制安装tomcat-8.5.59
先将二进制源码包从apache官网下载到指定目录，再进行解压缩安装
[root@localhost src]#tar xf apache-tomcat-8.5.59.tar.gz
[root@localhost src]#ln -s apache-tomcat-8.5.59 tomcat #创建一个软链接
[root@localhost src]#echo "PATH=/usr/local/src/tomcat/bin:$PATH" > /etc/profile.d/tomcat.sh #指定PATH变量，并使其生效
[root@localhost src]#. /etc/profile.d/tomcat.sh
3）、启动tomcat服务
[root@localhost src]#startup.sh
Using CATALINA_BASE: /usr/local/src/tomcat
Using CATALINA_HOME: /usr/local/src/tomcat
Using CATALINA_TMPDIR: /usr/local/src/tomcat/temp
Using JRE_HOME: /usr
Using CLASSPATH: /usr/local/src/tomcat/bin/bootstrap.jar:/usr/local/src/tomcat/bin/tomcat-juli.jar
Using CATALINA_OPTS:
Tomcat started.