Cannot SSH Google Cloud Instance -

Question

I've tried every method available in googles documentation - yet I still can't ssh into my compute engine instance on google cloud. Posting a log for context. ``` username@instancename:~$ gcloud compute ssh instancename --ssh-flag="-vvv" For the following instances: - [instancename] choose a zone: [1] asia-east1-c [2] asia-east1-a [3] asia-east1-b [4] asia-northeast1-b [5] asia-northeast1-c [6] asia-northeast1-a [7] europe-west1-c [8] europe-west1-b [9] europe-west1-d [10] us-central1-f [11] us-central1-a [12] us-central1-c [13] us-central1-b [14] us-east1-b [15] us-east1-d [16] us-east1-c [17] us-west1-b [18] us-west1-a Please enter your numeric choice: 13 OpenSSH_6.7p1 Debian-5+deb8u3, OpenSSL 1.0.1t 3 May 2016 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 104.xxx.xxx.xx [104.xxx.xxx.xx] port 22. debug1: Connection established. debug1: identity file /home/userna…

Accepted Answer

Below steps, will give you a serial access to your Google Cloud instance, from there you can Validate the Guest environment

I suggest you first to verify that SSH access to the instance is not blocked by a firewall.

gcloud compute firewall-rules list | grep "tcp:22"

Make sure you still have enough space disk left in the root volume,by running the following gcloud command in your shell.

gcloud compute instances get-serial-port-output [INSTANCE-NAME]

Look for some entry like

```
...No space left on device...

...google-accounts: ERROR Exception calling the response handler. [Errno 2] No usable temporary directory found in ['/tmp', '/var/tmp', '/usr/tmp', '/']...
```

Connect to the instance using the serial console

```
1. Go to the VM instances page in Google Cloud Platform console. 
2. Click on the instance for which you want to add a startup script. 
3. Click the Edit button at the top of the page.
4. Click on ‘Enable connecting to serial ports’
5. Under Custom metadata, click Add item. 
6. Set 'Key' to 'startup-script' and set 'Value' to this script:
```

```
#! /bin/bash 
useradd -G sudo USERNAME 
echo 'USERNAME:PASSWORD' | chpasswd
```

```
7. Click Save and then click RESET on the top of the page. You might need to wait for some time for the instance to reboot. 
8. Click on 'Connect to serial port' in the page. 
9.  In the new window, you might need to wait a bit and press on Enter of your keyboard once; then, you should see the login prompt. 
10. Login using the USERNAME and PASSWORD you provided.
```

To validate the guest environment

Then inside the instance you need to fetch which is not working by Validate the Guest Environment :

First: look in your serial console if these line below are listed :

```
Started Google Compute Engine Accounts Daemon 
Started Google Compute Engine IP Forwarding Daemon 
Started Google Compute Engine Clock Skew Daemon 
Started Google Compute Engine Instance Setup 
Started Google Compute Engine Startup Scripts 
Started Google Compute Engine Shutdown Scripts 
Started Google Compute Engine Network Setup
```

Second: Verify if the package for the guest Environment is installed run the command in your serial output

apt list --installed | grep google-compute

It should list the below line :

```
google-compute-engine
google-compute-engine-oslogin
python-google-compute-engine
python3-google-compute-engine
```

Third:you need to verify if all the services for the guest environment are running by running this command :

sudo systemctl list-unit-files | grep google | grep enabled

It should list the below line :

```
google-accounts-daemon.service      enabled
google-ip-forwarding-daemon.service enabled
google-clock-skew-daemon.service    enabled
google-instance-setup.service       enabled
google-shutdown-scripts.service     enabled
google-startup-scripts.service      enabled
google-network-setup.service        enabled
```

Cannot SSH Google Cloud Instance -

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