timedatectl set-local-rtc 1 –adjust-system-clock
[……]
Ubuntu和Windows双系统解决时区不一致的问题
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如何限制deb包被自动升级(想保留老版本)
转载自：https://askubuntu.com/questions/18654/how-to-prevent-updating-of-a-specific-package
dpkg或者apt二选一即可
dpkg层面
# Put a package on hold:
echo “<package-name> hold” | sudo dpkg –set-selections
# Remove the hold:
echo “<package-name[……]
iptables本地端口转发到远程端口
# Now, to forward port 9999 on host 192.168.202.103 to port 80 on host 192.168.202.105
# we need to add the following rules to the iptables configuration of host 192.168.202.103:
sudo iptables -t nat -A PREROUTING -p tcp –dport 9999 -j DNAT –to-d[……]
推荐调试socket.io的客户端神器
Chrome拓展：Firecamp[……]
Spring启用异步执行任务
# async executor
async:
corePoolSize: 20
maxPoolSize: 200
queueCapacity: 10000
然后代码中注入
@Autowired
private SpringAsyncExecutor asyncExecutor;
使用
Future<Map<Integer, String>> xxxFuture =
asyncExecutor.a[……]