Reto Höhener's questions

I'm trying to write an SSH key to /root/.ssh/authorized_keys during an automated 20.04 server install, but it fails, probably because of permission problems.

The 1st command is successful, the 2nd fails:

  late-commands:
    - echo 'test2' > /target/etc/test2
    - echo 'ssh-rsa ...' > /target/root/.ssh/authorized_keys

How could I achieve that?

Can someone provide some background?

It seems like this folder is growing even when I'm not updating or installing any packages, but I'm not entirely sure about that.

Context: My AWS instances keep running out of disk space, and i already learned to do this periodically:

apt-get -y autoremove
apt-get -y autoclean

But I don't understand why it grows in the first place.

Also see:

• Safe to remove /usr/src/linux-headers after purging older linux images?
• Why so many linux-headers, even for absent images

EDIT: On my very new server i get this:

du -h -d1 /usr/src/ | sort -hr
266M  /usr/src/
115M  /usr/src/linux-aws-headers-4.15.0-1035
115M  /usr/src/linux-aws-headers-4.15.0-1032
19M   /usr/src/linux-headers-4.15.0-1035-aws
19M   /usr/src/linux-headers-4.15.0-1032-aws

Not sure if this is possible at all.

And what about empty lines?

Update:

Testing the config with

logrotate -d /etc/logrotate.d/apache2

returns

error: /etc/logrotate.d/apache2:1 lines must begin with a keyword or a filename (possibly in double quotes)

for every empty line in the config file.

Original question about comment syntax is answered, though.

Update 2: This config now seems to work for me (note that it restarts apache after rotation):

/var/log/apache2/*.log {
    # https://stackoverflow.com/questions/26482773/apache-and-logrotate-configuration
    su root adm
    daily
    missingok
    rotate 14
    create 640 root adm
    # https://stackoverflow.com/questions/25845752/logrotate-suffix-dateext-rotate
    dateext
    dateformat -%Y-%m-%d.log
    sharedscripts
    postrotate
        systemctl restart apache2 || true
    endscript
}