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Photograph is my hobby, i like photo detail so i use high resolution camera. This ends with a lot of storage. Local storage is not a big deal, but i want to put them on Cloud so i can access it anywhere. I started with ICloud Photos with 200GB plan this is good for about a year then My ICloud is full and i need to upgrade to the next plan. The next plan is 2TB , it will cost 10.99 a month. My 200GB plan is only $2.99. Why there is no such plan like 500GB or 1TB. I started to look for someRead More →

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Why things are broken ? It’s simply because of changes. Can we avoid changes? No. Changes could be come from internal or external. Do we know what will be impacted if there is a tiny change? A good system can track about 90% what is related. There are some minor changes that might be never recorded. We can’t avoid change, we know we might miss something, so let minimize the risk. How can we do that? we need a system to monitor our system, if something go wrong, that monitor system will trigger an alert for us and we can take action as soon asRead More →

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Let say you have a load balancer with few thousand sites, the load balancer keeps track the response time from the backend server. Your log is saved in Splunk. Now, the application team comes to you and ask the site performance in the last 30 days. You think it’s easy, yes, when you start with last hour , the results come out within a minute. But when you do last 30 days, it’s a such a pain because the data is too large. Since last one hour seems to be OK, why don’t we dump that result data into some other faster database? Since it’sRead More →

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Virtualbox supports remote display – it’s like console access. This is helpful if you can’t access the server via normal method like ssh or rdp. i found an issue today that if we turn remote display , after we restarted the VM will crash. My lesson learn: only turn on remote display if you can’t access your VM from normal method, after you fix your issues, turn it off.Read More →

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In this article i want to share how i setup the a zero touch deployment using network. Tools use: Windows 2022 Windows ISO Images DHCP server ( Add DHCP role in the server management) MDT – Microsoft deployment tool kit (https://learn.microsoft.com/en-us/windows-hardware/get-started/adk-install) Windows ADK Windows PE Addons (https://learn.microsoft.com/en-us/windows-hardware/get-started/adk-install – i suggest we download the version 2004 – if we use the latest, we might have an error in MDT as the latest version doesn’t support x86) WDS – Windows deployment services ( Add WDS role in the server management) i would like to brief some of functionalities of these tools DHCP Server: In order to re-imageRead More →

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Here is the symptom: You press play or forward or backward – it stops running after 2s. If you press pause, you can see the tape spinning as normal. What could be the root cause: This could be because of the tape end detection circuit. The way it detect the tape end is using the tape counter, if the tape counter not spinning, it will think that the tape ends. How does it do that? Behind the tape counter, there is a magnetic ring, when this magnetic ring spinning, it turn on/off the circuit. If the magnetic not spinning, or it’s dropped out , theRead More →

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You might see this sudo yum -y install podman Updating Subscription Management repositories. Last metadata expiration check: 0:04:52 ago on Fri 22 Sep 2023 11:00:27 AM EDT. Error: Problem: cannot install the best candidate for the job – nothing provides libsubid.so.3()(64bit) needed by podman-3:4.4.1-8.module+el8.8.0+18438+15d3aa65.x86_64 (try to add ‘–skip-broken’ to skip uninstallable packages or ‘–nobest’ to use not only best candidate packages) This is how i fixed: wget https://cdn-ubi.redhat.com/content/public/ubi/dist/ubi8/8/x86_64/baseos/os/Packages/s/shadow-utils-subid-4.6-17.el8.x86_64.rpm sudo rpm -i shadow-utils-subid-4.6-17.el8.x86_64.rpm sudo yum -y install podmanRead More →

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Metric Logs are stateful are alert – which mean it will change the status to Fired/Resolved based on the metric condition. Metrics Alert is much cheaper than Log based alerts. As of now, it’s 0.1$ per month, it doesn’t matter your check interval. Logs based alerts are not stateful, it only “Fired” , it does not resolved. This alert can flood your mailbox. the way it works is , it runs a query, if that query meet your condition, it will triggered the alert. It doesn’t check the last run status to see if that has been triggered or not. Log based alerts are alsoRead More →