我的操作系统---
Ubuntu 18.04 LTS
我的Docker版本-
# docker --version
Docker version 19.03.6, build 369ce74a3c
我正在尝试构建docker映像-
docker build -t image:tag .
Sending build context to Docker daemon 187.9kB
Step 1/8 : FROM node:8.16.2-alpine3.9
---> 9c0651c52baf
Step 2/8 : RUN mkdir -p /app
---> Running in 85ecdcc9218c
它卡在第2步，没有任何活动。这是来自syslog的错误日志
dockerd[4988]: time="2020-02-20x08:28:27.xxxxxxxxxx" level=info msg="API listen on /var/run/docker.sock"
systemd[1]: Reloading.
systemd-udevd[5315]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
systemd-udevd[5315]: Could not generate persistent MAC address for vethaxxxxxx: No such file or directory
systemd-networkd[4063]: vethexxxxxx: Link UP
kernel: [ 2304.024934] docker0: port 1(vethexxxxxx) entered blocking state
kernel: [ 2304.024936] docker0: port 1(vethexxxxxx) entered disabled state
kernel: [ 2304.025182] device vethexxxxxx entered promiscuous mode
systemd-timesyncd[4039]: Network configuration changed, trying to establish connection.
systemd-udevd[5317]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
systemd-udevd[5317]: Could not generate persistent MAC address for vethexxxxxx: No such file or directory
kernel: [ 2304.029095] IPv6: ADDRCONF(NETDEV_UP): vethexxxxxx: link is not ready
systemd-timesyncd[4039]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
systemd-timesyncd[4039]: Network configuration changed, trying to establish connection.
systemd-timesyncd[4039]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
containerd[4987]: time="2020-02-20x08:31:18.xxxxxxxxxx" level=info msg="shim containerd-shim started" address="/containerd-shim/moby/85ecdcc9218c280e97de4bfd38b0d70d83bb601e58a61a2c58fff52db2c90042/shim.sock" debug=false pid=5326
systemd-timesyncd[4039]: Network configuration changed, trying to establish connection.
systemd-timesyncd[4039]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
systemd-timesyncd[4039]: Network configuration changed, trying to establish connection.
systemd-networkd[4063]: vethexxxxxx: Gained carrier
systemd-networkd[4063]: docker0: Gained carrier
kernel: [ 2304.285614] eth0: renamed from vetha3b6298
kernel: [ 2304.285866] IPv6: ADDRCONF(NETDEV_CHANGE): vethexxxxxx: link becomes ready
kernel: [ 2304.285900] docker0: port 1(vethe0b5233) entered blocking state
kernel: [ 2304.285901] docker0: port 1(vethe0b5233) entered forwarding state
systemd-timesyncd[4039]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
systemd-networkd[4063]: vethe0b5233: Gained IPv6LL
systemd-timesyncd[4039]: Network configuration changed, trying to establish connection.
systemd-timesyncd[4039]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
此外，如果我按^ C进行快速构建过程，它也会破坏ssh连接。