几个月以来，有一台服务器一直在ssh的时候卡在debug1: pledge: network。

是如此，因为正在调试CI/CD所以，很耽误工作。

虽然好一顿google，但多数的办法都没有意义。似乎有人说这是一个dbus的未解决的issue。

所以，干脆我把dbus卸载了，然后，不卡了。不清楚这样服务器还是不是能用。

apt-get remove dbus

:~$ ssh yhao@my-ub18-host -v
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to my-ub18-host [128.224.179.178] port 22.
debug1: Connection established.
debug1: identity file /home/wrsadmin/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wrsadmin/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000
debug1: Authenticating to my-ub18-host:22 as 'yhao'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:51a4txgygCWvH7DyxrlXXXX
debug1: Host 'my-ub18-host' is known and matches the ECDSA host key.
debug1: Found key in /home/wrsadmin/.ssh/known_hosts:7
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering public key: RSA SHA256:oLsi/XcdkawT...HV4bI /home/wrsadmin/.ssh/id_rsa
debug1: Server accepts key: pkalg rsa-sha2-512 blen 279
debug1: Authentication succeeded (publickey).
Authenticated to my-ub18-host ([100.224.169.178]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network   # 卡在这里
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Sending environment.
debug1: Sending env LC_MEASUREMENT = zh_CN.UTF-8
debug1: Sending env LC_PAPER = zh_CN.UTF-8
debug1: Sending env LC_MONETARY = zh_CN.UTF-8
debug1: Sending env LANG = en_US.UTF-8
debug1: Sending env LC_NAME = zh_CN.UTF-8
debug1: Sending env LC_ADDRESS = zh_CN.UTF-8
debug1: Sending env LC_NUMERIC = zh_CN.UTF-8
debug1: Sending env LC_TELEPHONE = zh_CN.UTF-8
debug1: Sending env LC_IDENTIFICATION = zh_CN.UTF-8
debug1: Sending env LC_TIME = zh_CN.UTF-8
Welcome to Ubuntu 18.04.3 LTS (GNU/Linux 5.0.0-32-generic x86_64)

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Last login: Tue Nov 26 09:27:54 2019 from 128.224.155.106