我在 2 个月前启动了一个新实例 (i-d23f3a5c)，并且每天都无法访问。
查看 /var/log/messages 我可以看到 dhcp 客户端经常请求租用，并且有时会出现消息“dhclient1306：fork：无法分配内存”。
从那里服务器不再可访问，需要重新启动（我想它已经丢失了它的内部 ip）。
Aug 19 08:47:19 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5 (xid=0x7daf4b5c)
Aug 19 08:47:37 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6 (xid=0x7daf4b5c)
Aug 19 08:48:02 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13 (xid=0x7daf4b5c)
Aug 19 08:48:37 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 21 (xid=0x7daf4b5c)
Aug 19 08:49:24 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10 (xid=0x7daf4b5c)
Aug 19 08:49:43 ip-172-31-16-179 dhclient[2144]: No DHCPOFFERS received.
Aug 19 08:50:11 ip-172-31-16-179 dhclient[2144]: No working leases in persistent database - sleeping.
Aug 19 08:51:09 ip-172-31-16-179 dhclient[2144]: fork: Cannot allocate memory
Aug 19 08:59:09 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x322ab770)
Aug 19 08:59:46 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19 (xid=0x322ab770)
Aug 19 09:00:15 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 17 (xid=0x322ab770)
Aug 19 09:01:14 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14 (xid=0x322ab770)
Aug 19 09:01:47 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7 (xid=0x322ab770)
Aug 19 09:02:26 ip-172-31-16-179 dhclient[2144]: No DHCPOFFERS received.
Aug 19 09:03:12 ip-172-31-16-179 dhclient[2144]: No working leases in persistent database - sleeping.
Aug 19 09:04:17 ip-172-31-16-179 dhclient[2144]: fork: Cannot allocate memory
Aug 19 09:14:10 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3 (xid=0x1c2c358)
Aug 19 09:14:55 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6 (xid=0x1c2c358)
Aug 19 09:15:30 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11 (xid=0x1c2c358)
Aug 19 09:16:22 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8 (xid=0x1c2c358)
Aug 19 09:17:01 ip-172-31-16-179 dhclient[2144]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 16 (xid=0x1c2c358)
Aug 19 09:17:43 ip-172-31-16-179 dhclient[2144]: No DHCPOFFERS received.
依此类推，直到我从 EC2 控制台重新启动它。
最好的做法是什么？
remove DHCP - is that possible ?
restart dhcp client on regular basis ?
increase the number of possible fork (issue will probably arise at some point)
change the renew time to a longer time ?
fix the dhcp client ?
谢谢，
Ankit