我有一台EC2机器，我可以通过命令行SSH进入。现在，我正在尝试执行这台机器是库存的剧本。我的库存文件如下所示：
default ansible_host=ec2-xx.xx.xx.xx.us-west-2.compute.amazonaws.com ansible_user='ubuntu' ansible_ssh_private_key_file='~/.ssh/my_aws.pem'
当我尝试执行剧本时，ansible失败了：
ERROR！ SSH遇到未知错误
生成详细日志记录显示“Authentication succeeded (publickey)”。我不知道连接失败的原因。详细记录如下：
{"changed": false, "msg": "ERROR! SSH encountered an unknown error. The output was:
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /Users/my_user/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: auto-mux: Trying existing master
debug1: Control socket \"/Users/my_user/.ansible/cp/ansible-ssh-ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com-22-ubu\" does not exist
debug2: ssh_connect: needpriv 0
debug1: Connecting to ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com [xx.xxx.x.xx] port 22.
debug2: fd 3 setting O_NONBLOCK
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug3: timeout: 9962 ms remain after connect
debug1: key_load_public: No such file or directory
debug1: identity file /Users/my_user/.ssh/my_aws.pem type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/my_user/.ssh/my_aws.pem-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH_6.6.1* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com:22 as 'ubuntu'
debug3: hostkeys_foreach: reading file \"/Users/my_user/.ssh/known_hosts\"
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-md5-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-md5-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: zlib@openssh.com,zlib,none
debug2: kex_parse_kexinit: zlib@openssh.com,zlib,none
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug1: kex: server->client chacha20-poly1305@openssh.com <implicit> zlib@openssh.com
debug1: kex: client->server chacha20-poly1305@openssh.com <implicit> zlib@openssh.com
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:xxxxxxxxxxx
debug3: hostkeys_foreach: reading file \"/Users/my_user/.ssh/known_hosts\"
debug3: hostkeys_foreach: reading file \"/Users/my_user/.ssh/known_hosts\"
Warning: Permanently added 'ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com,xx.xxx.x.xx' (ECDSA) to the list of known hosts.
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /Users/my_user/.ssh/my_aws.pem (0x0), explicit
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred gssapi-with-mic,gssapi-keyex,hostbased,publickey
debug3: authmethod_lookup publickey
debug3: remaining preferred: ,gssapi-keyex,hostbased,publickey
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/my_user/.ssh/my_aws.pem
debug3: sign_and_send_pubkey: RSA SHA256:xxxxxxxxxxxx
debug2: we sent a publickey packet, wait for reply
debug1: Enabling compression at level 6.
debug1: Authentication succeeded (publickey).
Authenticated to ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com ([xx.xxx.x.xx]:22).
debug1: setting up multiplex master socket
debug3: muxserver_listen: temporary control path /Users/my_user/.ansible/cp/ansible-ssh-ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com-22-ubuntu.JNNIIMYaFyD7UIF3
unix_listener: \"/Users/my_user/.ansible/cp/ansible-ssh-ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com-22-ubuntu.JNNIIMYaFyD7UIF3\" too long for Unix domain socket
", "unreachable": true}
答案 0 :(得分：3)
unix_listener：\＆＃34; /Users/my_user/.ansible/cp/ansible-ssh-ec2-xx-xxx-x-xx.us-west-2.compute.amazonaws.com-22-ubuntu。 JNNIIMYaFyD7UIF3 \＆＃34;对于Unix域套接字来说太长了
是问题所在。您需要配置Ansible以存储较短的UNIX域套接字。该路径不应超过92个字符，因为unix（7）建议：
编写可移植应用程序时，请记住某些实现的sun_path最短为92个字节。
一种可能性是设置ansible.cfg缩短control_path，例如：
control_path = %(directory)s/%%C
或完全禁用多路复用（会对性能产生影响！）：
ssh_args = -o ControlMaster=off
documentation中描述了这些选项，不久前我回答了similar question。