虚拟机崩溃导致mpi报错（断网）

虚拟机（Ubuntu）崩溃重启后，之前能用的mpi现在用不了了，提示：

Invalid error code (-2) (error ring index 127 invalid)
INTERNAL ERROR: invalid error code fffffffe (Ring Index out of range) in MPID_nem_tcp_init:373
Fatal error in PMPI_Init: Other MPI error, error stack:
MPIR_Init_thread(586)..............: 
MPID_Init(224).....................: channel initialization failed
MPIDI_CH3_Init(105)................: 
MPID_nem_init(324).................: 
MPID_nem_tcp_init(175).............: 
MPID_nem_tcp_get_business_card(401): 
MPID_nem_tcp_init(373).............: gethostbyname failed, xxx-machine (errno 0)

输入ip -c addr show后显示

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:0c:29:33:8e:ba brd ff:ff:ff:ff:ff:ff
    altname enp2s1

state DOWN表示网卡未启用

执行

sudo ip link set ens33 up  # 启用网卡
sudo dhclient -v ens33     # 请求DHCP地址

然后再输入ip -c addr show，正常情况应看到：

2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> state UP 
    inet 192.168.x.x/24 ...  # 获得有效IP

问题就解决了