数据库连接池配置

HikariCP: 光 HikariCP (opens new window)

curl -v https://www.baidu.com

postgresql tcp_keepalives 配置说明

PostgreSQL: Documentation: 15: 20.3. Connections and Authentication (opens new window)

linux 默认 tcp 配置

Using TCP keepalive under Linux (opens new window)

istio tcp_keepalives 配置说明

Istio / Destination Rule (opens new window)

抓包

sudo tcpdump -i lo0 dst port 54322 or src port 54322

Tcp 测试

cyberelf/netcat-keepalive: Classic netcat with tcp keepalive switches. (opens new window)

Implementing long-running TCP Connections within VPC networking | Networking & Content Delivery (opens new window)

  cat /proc/sys/net/ipv4/tcp_keepalive_time
  7200

  cat /proc/sys/net/ipv4/tcp_keepalive_intvl
  75

  cat /proc/sys/net/ipv4/tcp_keepalive_probes
  9

  echo 30 > /proc/sys/net/ipv4/tcp_keepalive_time

  echo 5 > /proc/sys/net/ipv4/tcp_keepalive_intvl

  echo 2 > /proc/sys/net/ipv4/tcp_keepalive_probes

 sysctl \
  net.ipv4.tcp_keepalive_time \
  net.ipv4.tcp_keepalive_intvl \
  net.ipv4.tcp_keepalive_probes

 sysctl -w \
  net.ipv4.tcp_keepalive_time=30 \
  net.ipv4.tcp_keepalive_intvl=5 \
  net.ipv4.tcp_keepalive_probes=2

ALTER SYSTEM SET tcp_keepalives_idle=30;
ALTER SYSTEM SET tcp_keepalives_interval=5;
ALTER SYSTEM SET tcp_keepalives_count=2;

show tcp_keepalives_idle;
show tcp_keepalives_interval;
show tcp_keepalives_count;

jdbc:postgresql://postgres:123456@localhost:5432/di_application

curl https://reqbin.com/echo \
   -H "Connection: keep-alive" \
   -H "Keep-Alive: timeout=5, max=100"