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SSH

OS Login enables centralized SSH key management with IAM, and it disables metadata-based SSH key configuration on all instances in a project. OS Login can be enabled on the project level or on the instance level. Instance-level values override the project-level value.

• OS Login Reference

Instructions

1. Access project
   • https://console.cloud.google.com/compute/instances?project=[project-id]
2. Click Metadata
3. Click Edit, and then click Add item.

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Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)

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{{
# /opt/my-app/consul.ctmpl
#
# This file is read by Consul Template and rendered onto disk using
# the configuration placed in /etc/consul-template.d.
}}

{{ with vault "postgresql/creds/readonly" }}
[config]
  username = "{{ .Data.username }}"