Redis Distributed Lock Failures During Master-Slave Failover and Mitigation Strategies
Redis Lock Vulnearbility Analysis
Asynchronous replication creates critical vulnerabilities during failover scenarios:
Timeline:
1. Client A acquires lock on master (SET resource_id unique_val NX EX 30)
2. Lock replication to replica delayed (ms to hundreds of ms)
3. Master fails, sentinel triggers failover (3-10 seconds)
4. Replica becomes new ...
Posted on Mon, 25 May 2026 19:45:58 +0000 by 182x
Renewing Certificates in Kubernetes High Availability Clusters
This command displays the expiration and remaining validity time for all certificates, including client certificates in the /etc/kubernetes/pki directory and client certificates embedded in KUBECONFIG files (admin.conf, controller-manager.conf, scheduler.conf). ### Manual Certificate Renewal The kubeadm certs renew command allows manual certif ...
Posted on Mon, 18 May 2026 01:26:52 +0000 by kiss_FM
Resolving kube-apiserver Startup Failure Due to --etcd-servers Configuration Error
When kube-apiserver fails to start, check the service status:
systemctl status kube-apiserver
Examine system logs for detailed error messages:
cat /var/log/messages | grep kube-apiserver | grep -i error
If the log shows Error: --etcd-servers must be specified, verify the configuration file /usr/local/kubernetes/cfg/kube-apiserver.conf. Even i ...
Posted on Thu, 14 May 2026 02:17:25 +0000 by treeleaf20