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Docker, systemd-resolved and corporate VPN

Posted 04-29-2021 at 11:44 AM by serafean

Tags docker, systemd

There's no going around it, I really need that docker image now. Unfortunately everything is corporate. apt repositories, conan repositories. Docker needs resolve and contact machines through the local openconnect vpn0 interface.

1. Docker kills my internet

My LAN runs in the 172.17.0.0/16 range. Docker uses that same range.
Easy fix. Set it in daemon.json

Code:

{
  "default-address-pools": [
    {
      "base": "172.22.24.0/24",

...

serafean

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Setting up DNS in 2017 - A record to TLSA

Posted 03-23-2017 at 02:28 PM by serafean
Updated 03-23-2017 at 03:14 PM by serafean

I set off on the journey to set up DNS as correctly as I could. After reading through a lot of stuff, here are my findings:
This example server will have on IP, and will run a web server, and an email server.
This is more of a setup dump than tutorial, but might point someone in the right direction...

Prequisites:

First, create an A (AAAA for ipv6 ) record for the domain :

Code:

example.net. 1800 IN A 127.0.0.1

Basic explanation of the entry

example.net.

...

serafean

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Posted in Uncategorized

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nftables NAT

Posted 10-03-2016 at 04:04 PM by serafean
Updated 10-03-2016 at 04:08 PM by serafean

Finally getting around to writing the continuation of this howto. Now lets take a look at a basic router firewall.
Basic ruleset configuration is described here.
This ruleset only sets up ipv4 nating, no filtering is set up (that will be covered later)
The following is an nft configuration file. To be loaded with nft -f.

Code:

define if_wan = eth0
table ip filter {
        map tcp_nat_map {type inet_service : ipv4_addr;}
        map udp_nat_map

...

serafean

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Posted in nftables

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systemd yacy "hardened" unit

Posted 08-31-2016 at 01:51 PM by serafean

This is more of an archive for my yacy service file

Code:

[Unit]
Description=Yacy distributed search engine

[Service]

#Service
Type=forking
GuessMainPID=yes
ExecStart=/opt/yacy/startYACY.sh
ExecStop=/opt/yacy/stopYACY.sh
User=yacy
Group=yacy
WorkingDirectory=/opt/yacy

# Hardening
PrivateTmp=yes
PrivateDevices=yes
ProtectSystem=full
ProtectHome=yes
NoNewPrivileges=yes

...

serafean

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systemd 219 && systemd-networkd changes

Posted 02-22-2015 at 07:45 AM by serafean

Tags systemd

The recent update to systemd sent it to version 219. Per the changelog, .network files gained two new configuration values

Code:

IPForward
IPMasquerade

After the upgrade, my Gentoo box stopped routing packets to the internet. NAT was setup correctly, so the issue couldn't be there.

It appears that systemd by default sets the forwarding sysctl of each interface to 0. In order for packets to be forwarded, this must be set to 1. /etc/sysctl.conf was of no help.
...

serafean

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