redis知识积累

这里会记录redis的一些常用命令与理论

redis常用命令

容器内安装redis
apk add redis

ps -ef|grep redis
which redis-cli
redis-cli -h 192.168.201.208
auth redis_pwd


查询配置
config get tcp-keepalive

查询redis客户端总数，我见过1000多的，也有几十个的
info clients

查询redis客户端列表信息
client list

查询redis最大客户端连接数，默认是10000
config get maxclients

查询大key
redis-cli -h www.baidu.com -a password --bigkeys

redis知识理论

redis默认的tcp-keepalive是300秒，可以通过添加依赖，自定义tcp_user_timeout

       <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-transport-native-epoll</artifactId>
            <classifier>linux-aarch_64</classifier>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-transport-native-epoll</artifactId>
            <classifier>linux-x86_64</classifier>
        </dependency>

代码实现

protected ClientResources createClientResource() {

    return ClientResources.builder()
            .nettyCustomizer(new NettyCustomizer() {
                @Override
                public void afterBootstrapInitialized(Bootstrap bootstrap) {
                    if (EpollProvider.isAvailable()) {
                        // TCP_USER_TIMEOUT >= TCP_KEEPIDLE + TCP_KEEPINTVL * TCP_KEEPCNT
                        // https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/
                        bootstrap.option(EpollChannelOption.TCP_USER_TIMEOUT, 7000);
                    }
                }
            }).build();
}