====== Настройка кластера redis на трех серверах ======
Требуется на виртуальных машинах, работающих на ОС debian 11 c IP адресами: 192.168.255.131 192.168.255.132 192.168.255.133, создать кластер redis-server

===== Подготовка к установке кластера =====

Создаем первую машину и на ней выполняем настройку сервера.

<Code:bash|Первым делом обновляем ОСь, устанавливаем redis-server и выключаем его>
# Обновляем ОСь
apt update && apt upgrade -y
# Установка сервера redis
apt install redis-server -y
systemctl disable redis-server.service
systemctl stop redis-server.service
</Code>
===== Создаем конфиг демона сервера redis =====

<Code:bash|Создаем конфиг демона сервера redis>

cat << EOF > /etc/systemd/system/redis-cluster-node@.service
[Unit]
Description=redis cluster instance at port %i
After=network.target
Documentation=http://redis.io/documentation, man:redis-server(1)

[Service]
Type=forking
ExecStart=/usr/bin/redis-server /etc/redis/redis.conf \
    --cluster-enabled yes \
    --dbfilename dump_%i.rdb \
    --port %i --cluster-config-file nodes_%i.conf \
    --pidfile /var/run/redis/redis-server_%i.pid \
    --logfile /var/log/redis/redis-server_%i.log

PIDFile=/var/run/redis/redis-server_%i.pid
TimeoutStopSec=0
Restart=always
User=redis
Group=redis
RunTimeDirectory=redis

ExecStartPre=-/bin/run-parts --verbose /etc/redis/redis-server.pre-up.d
ExecStartPost=-/bin/run-parts --verbose /etc/redis/redis-server.post-up.d
ExecStop=-/bin/run-parts --verbose /etc/redis/redis-server.pre-down.d
ExecStop=/bin/kill -s TERM $MAINPID
ExecStopPost=-/bin/run-parts --verbose /etc/redis/redis-server.post-down.d

UMask=007
PrivateTmp=yes
LimitNOFILE=65535
PrivateDevices=yes
ProtectHome=yes
ReadOnlyDirectories=/
ReadWriteDirectories=-/var/lib/redis
ReadWriteDirectories=-/var/log/redis
ReadWriteDirectories=-/var/run/redis
CapabilityBoundingSet=~CAP_SYS_PTRACE

# redis-server writes its own config file when in cluster mode so we allow
# writing there (NB. ProtectSystem=true over ProtectSystem=full)
ProtectSystem=true
ReadWriteDirectories=-/etc/redis

[Install]
WantedBy=multi-user.target

EOF

</Code>
===== Конфигурируем сервер redis =====

<Code:bash|Конфигурируем сервер redis>
mkdir -p /etc/redis/redis-server.pre-up.d
mkdir -p /etc/redis/redis-server.post-up.d
mkdir -p /etc/redis/redis-server.pre-down.d
mkdir -p /etc/redis/redis-server.post-down.d
mkdir -p /run/redis

chown -R  redis:redis  /etc/redis/
chown redis:redis /run/redis/
systemctl daemon-reload

sed -i '/^appendonly/s/no/yes/' /etc/redis/redis.conf
sed -i '/^bind/s/127.0.0.1/0.0.0.0/' /etc/redis/redis.conf

systemctl enable redis-cluster-node@7000
systemctl enable redis-cluster-node@7001
systemctl enable redis-cluster-node@7002

systemctl start redis-cluster-node@7000.service
systemctl start redis-cluster-node@7001.service
systemctl start redis-cluster-node@7002.service
</Code>