Docker (Ubuntu, Linux) – #ERROR: Couldn’t connect to Docker daemon at http+docker://localhost – is it running?

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it’s means in many times(%95), your user not under docker group placed, or your post-install (docker group, user actions etc. steps) not completely done yet. For temporary fix, you can your docker/docker-compose command with sudo run.

kzorloglu@kzorloglu:~/projects/chameleon$ composer up
#ERROR: Couldn't connect to Docker daemon at http+docker://localhost - is it running?

If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

to

kzorloglu@kzorloglu:~/projects/chameleon$ sudo composer up

SSH Connection without Password

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    ~ ssh-copy-id yoursshusername@yourservername.com
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/c/Users/USER/.ssh/id_ed25519.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
sshyoursshusername@yourservername.com's password: <<---HERE IS YOUR SSH PASSWORD QUESTION ONE TIME -->

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'yoursshusername@yourservername.com'"
and check to make sure that only the key(s) you wanted were added.
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