zenthangplus

# To do that, you need to create symlink from your file (inside container) to docker's output file.

# Add bellow line to your Dockerfile
RUN ln -sf /proc/1/fd/1 /var/log/cronjob.log

# EXPLAIN:
# The first 1 is the PID of docker process.
# The second 1 is standard output

zenthangplus

#!/usr/bin/env bash

# Error example: 
# ERROR: for redis cannot stop container: 16028f9: 
# Cannot kill container 16028f9: unknown error after kill: docker-runc did not terminate sucessfully: 
# container_linux.go:393: signaling init process caused "permission denied"
#
# This error was caused by AppArmor service in Ubuntu
# It was not working normally due to some unknown issues.
# Run following commands to fix it.

zenthangplus

#!/usr/bin/env bash

# Generate rsa keys pair
ssh-keygen -t rsa -b 4096 -f rs256.rsa

# Don't add passphrase
openssl rsa -in rs256.rsa -pubout -outform PEM -out rs256.rsa.pub

# Done
cat rs256.rsa