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I'm setting up automated deployment with TRAVIS CI, but my script gets stuck when trying to rsync to my server. From what I can tell, it's the SSH login that's failing, specifically the publickey login.

My YAML file (User, Host, Dir and Key Decryption (openssl aes--256-cbc etc...) replaced) :

language: node_js 
node_js:
- 10.7.0 
addons:
 ssh_known_hosts: <HOST> 
 hosts: <HOST> 
branches: 
 only:
 - master 
env: 
 global:
 - DEPLOY_USER=<USER>
 - DEPLOY_HOST=<HOST>
 - DEPLOY_DIRECTORY=<DIR> 
before_install:
- npm install -g npm@6.4.1 
install:
- npm install 
script:
- npm run build 
before_deploy:
- <DECRYPTION> -in deploy_rsa.enc -out /tmp/deploy_rsa -d
- eval "$(ssh-agent -s)"
- chmod 600 /tmp/deploy_rsa
- ssh-add /tmp/deploy_rsa 
deploy: 
 provider: script 
 skip_cleanup: true 
 script: rsync -r --delete-after --quiet -e"ssh -v -i /tmp/deploy_rsa" $TRAVIS_BUILD_DIR/dist/ <USER>@<HOST>:<DIR> 
on:
 branch: master

Everything works fine until the rsync, which gives this log (again, hostname, user and ECDSA key replaced here) :

Deploying application
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /home/travis/.ssh/config
debug1: /home/travis/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to <HOST> [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /tmp/deploy_rsa type -1
debug1: identity file /tmp/deploy_rsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.8
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.8
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.8 pat OpenSSH_6.6.1* compat 0x04000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA <ECDSA>
debug1: Host '<HOST>' is known and matches the ECDSA host key.
debug1: Found key in /home/travis/.ssh/known_hosts:11
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /tmp/deploy_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /tmp/deploy_rsa
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
<USER>@<HOST>'s password: debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: password

When I try the same rsync command from my own machine (with the same publickey and a test folder), it works and gives this :

debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: deploy_rsa
debug1: Authentication succeeded (publickey).
Authenticated to <HOST>.

I've scoured documentation, searched far and wide, tried a lot of different things already, different ways to add the key to the ssh-agent, specifying it manually, sudo true/false/required, etc... and i'm at a loss.

I'm noticing slight differences of log, the TRAVIS log seems to think my server accepts password authentications, whereas my own machine's log shows only "publickey" as a valid method, which is correct since password authentication is disabled.

The ssh-agent correctly tries to give the key in /tmp/deploy_rsa, which for some reason fails, then I manually give it, it shows key_parse_private2: missing begin marker (which from my searching seems to be a normal message indicating a successful passwordless login?) and seems to fail again.

Would there be a way to make TRAVIS understand that password login is disabled? To force the ssh-agent to only use publickey ? And why does it seemingly retries (tries key from ssh-agent, tries my key, etc...) but is not showing any failure messages, the key seems recognized and valid.

Possible the decrypted key (deploy_rsa) is not valid ? the same key, before encrypting with travis encrypt-file deploy_rsa --add works on my machine.

Thank you in advance for your answers.

Well it turns out Travis CI doesn't want domain names (even though this works in every other context for me), and absolutely needed the IP address.

I tried it but had other earlier problems (decrypting private key) and forgot to try the IP once those were fixed.

I feel silly, but now it works.