Selfhosted

61086 readers

1157 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Detailed Rules Post

Be civil.
No spam.
Posts are to be related to self-hosting.
Don't duplicate the full text of your blog or readme if you're providing a link.
Submission headline should match the article title.
No trolling.
Promotion posts require active participation, with an account that is at least 30 days old. F/LOSS without a paywall has exceptions, with requirements. See the rules link for details. Tags [CBH] or [AIP] are required, see the links in Rule 8 for details.
AI-related discussions and AI-involved promotional posts have additional requirements for tagging, as noted in Rule 7 and the AI & Promotional Post Expanded Rules post, and find example disclosures here.

Resources:

selfh.st Newsletter and index of selfhosted software and apps
awesome-selfhosted software
awesome-sysadmin resources
Self-Hosted Podcast from Jupiter Broadcasting

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 3 years ago

MODERATORS

curbstickle@anarchist.nexus

curbstickle_lw@lemmy.world

105

Docker security (lemmy.zip)

submitted 7 months ago* (last edited 7 months ago) by jobbies@lemmy.zip to c/selfhosted@lemmy.world

48 comments fedilink hide all child comments

You're probably already aware of this, but if you run Docker on linux and use ufw or firewalld - it will bypass all your firewall rules. It doesn't matter what your defaults are or how strict you are about opening ports; Docker has free reign to send and receive from the host as it pleases.

If you are good at manipulating iptables there is a way around this, but it also affects outgoing traffic and could interfere with the bridge. Unless you're a pointy head with a fetish for iptables this will be a world of pain, so isn't really a solution.

There is a tool called ufw-docker that mitigates this by manipulating iptables for you. I was happy with this as a solution and it used to work well on my rig, but for some unknown reason its no-longer working and Docker is back to doing its own thing.

Am I missing an obvious solution here?

It seems odd for a popular tool like Docker - that is also used by enterprise - not to have a pain-free way around this.

you are viewing a single comment's thread
view the rest of the comments

[–] BCsven@lemmy.ca 3 points 7 months ago

Not sure about the distro being used, opensuse makes a docker zone to put docker interfaces on, those have their own ports and rules separate then the Ethernet assigned zone ports/services to allow. For me I had the opposite issue, I couldn't reach my docker containers from my lan, onky from the local machine because the Ethernet was on an internal zone and Docker was on its own zone. I'm not a superskilled networker dude so I just turned on forwarding and masquerade so the incoming LAN zone would forward to doocker zone and pretend to be the local machine connecting and not a LAN or remote IP. I guess if you moved your dockers too the public zone you could get in trouble