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Why do my Docker containers randomly stop responding after running fine for several hours on a cloud VM?
This happens because the host machine is running out of memory and the Linux OOM killer is silently terminating container processes. In cloud VMs, Docker containers share the host’s memory unless limits are explicitly set. When memory pressure increases, Linux kills whichever process it considers leRead more
This happens because the host machine is running out of memory and the Linux OOM killer is silently terminating container processes.
In cloud VMs, Docker containers share the host’s memory unless limits are explicitly set. When memory pressure increases, Linux kills whichever process it considers least important, which is often a containerized app. Docker does not always report this clearly, so from the outside it looks like the service just froze.
You can confirm this by checking the VM’s system logs:
dmesg | grep -i kill
If you see messages about processes being killed due to memory, that’s the cause. The fix is to set proper memory limits and ensure the VM has enough RAM for peak load:
docker run -m 1g --memory-swap 1g myapp
In Kubernetes, this is done through resource requests and limits. Without them, nodes can overcommit memory and start killing pods unpredictably.
A less obvious variation is memory leaks inside the container, which slowly push the host into OOM even if the initial footprint looks fine.
See lessWhy does token-based authentication break after deployment?
Token issues after deployment usually come from configuration mismatches. Common causes include incorrect issuer URLs, audience values, signing keys, or clock drift between systems. Even small differences between environments can invalidate tokens. Verifying identity provider configuration consistenRead more
Token issues after deployment usually come from configuration mismatches. Common causes include incorrect issuer URLs, audience values, signing keys, or clock drift between systems.
Even small differences between environments can invalidate tokens. Verifying identity provider configuration consistency is often the fastest way to diagnose the issue.
Takeaway: Token security depends heavily on consistent environment configuration.
See lessWhy does zero-trust architecture still require network controls?
Zero trust shifts the primary trust decision to identity and context, but it doesn’t remove the need to limit exposure. Network controls still play an important role in reducing blast radius when credentials are compromised. If identity is the only line of defense, a single failure can expose largeRead more
Zero trust shifts the primary trust decision to identity and context, but it doesn’t remove the need to limit exposure. Network controls still play an important role in reducing blast radius when credentials are compromised.
If identity is the only line of defense, a single failure can expose large parts of the environment. Segmentation ensures that even valid identities can only reach what they explicitly need.
Zero trust works best when combined with sensible network boundaries.
Takeaway: Zero trust strengthens identity checks, but containment still matters.
See lessWhy does incident response slow down during real attacks?
Incident response often slows down because operational gaps become visible only under stress. Missing permissions, unclear ownership, and untested tools create friction at exactly the wrong moment. Teams may spend valuable time figuring out who can approve actions, access systems, or communicate extRead more
Incident response often slows down because operational gaps become visible only under stress. Missing permissions, unclear ownership, and untested tools create friction at exactly the wrong moment.
Teams may spend valuable time figuring out who can approve actions, access systems, or communicate externally. Without rehearsed workflows, even experienced teams hesitate.
Improving response speed usually requires practicing scenarios, clarifying roles, and removing access bottlenecks ahead of time.
Takeaway: Fast response comes from preparation, not urgency.
See lessWhy do my APIs return 401 Unauthorized even though the access token is valid?
A valid token only confirms that the caller’s identity has been verified. It does not automatically mean the caller is allowed to access every endpoint. Most APIs enforce authorization rules based on scopes, roles, or audience claims embedded in the token. If the token lacks a required scope or if tRead more
A valid token only confirms that the caller’s identity has been verified. It does not automatically mean the caller is allowed to access every endpoint. Most APIs enforce authorization rules based on scopes, roles, or audience claims embedded in the token.
If the token lacks a required scope or if the audience claim doesn’t match what the API expects, the request will be rejected even though authentication succeeded. This is especially common when the same identity provider is used across multiple APIs with different permission models.
See lessWhy does zero-trust adoption face internal resistance?
Zero trust introduces friction by design. Without communication and gradual rollout, users perceive it as unnecessary restriction. Successful adoption balances security with usability and clear explanation. Takeaway: Zero trust succeeds through collaboration, not enforcement alone.
Zero trust introduces friction by design. Without communication and gradual rollout, users perceive it as unnecessary restriction.
Successful adoption balances security with usability and clear explanation.
Takeaway: Zero trust succeeds through collaboration, not enforcement alone.
See less