Deepak Prasad

Learn how to create a Seaborn scatter plot using sns.scatterplot(). See examples with hue, style, size, palette, marker size, transparency, labels, legends, and regression lines.

Learn how to remove a key from a Python dictionary using pop(), del, dictionary comprehension, and safe methods to avoid KeyError when the key may not exist.

Learn the Python zipfile module with examples. Create and append ZIP archives, list and read members, extract files safely, handle passwords on read, choose compression, use BytesIO, and rebuild archives without a …

Learn how to sort a dictionary by key in Python using sorted(), dict(), lambda, itemgetter(), reverse=True, case-insensitive sorting, and nested dictionary examples.

We walk you through Kubernetes DNS failures with the CoreDNS and kube-dns checks we use in real incidents—NXDOMAIN, SERVFAIL, ndots, NetworkPolicy port 53, and external DNS—so you can copy the same commands on your …

Learn tree data structure in Python with simple examples. Understand nodes, root, children, binary trees, binary search trees, DFS, BFS, inorder, preorder, and postorder traversal.

Learn how to sort a dictionary by value in Python using sorted(), lambda, itemgetter(), reverse=True, and custom sorting. See examples for ascending order, descending order, duplicate values, and nested dictionaries.

Learn how to split a string in Python using str.split(). See examples for splitting by whitespace, comma, newline, multiple spaces, maxsplit, rsplit(), splitlines(), and regex delimiters.

Learn Python sets with simple examples. See how to create a set, add and remove items, check membership, remove duplicates, and use union, intersection, difference, symmetric difference, issubset, issuperset, and …

Learn how to append to a string in Python using +, +=, f-strings, format(), and join(). Understand why Python strings have no append() method and when to use each approach.

Learn how to check if a string contains a substring in Python using the in operator, find(), index(), count(), and regex. See case-sensitive, case-insensitive, multiple substring, whole-word, and pattern matching …

Learn Python string formatting using f-strings, str.format(), and percent formatting. See examples for variables, numbers, decimal precision, padding, alignment, percentages, dates, and %d meaning in Python.

Learn how to replace text in a file using Python. See examples for replacing a string in the same file, writing to a new file, handling large files, using fileinput with backup, and regex replacement with re.sub().

Learn what a tuple is in Python with simple examples. See how to create tuples, access items, use indexing and slicing, unpack tuples, compare tuples with lists, and use tuple methods.

Learn how to check the type of a variable in Python using type() and isinstance(). See when to use each method, how to check multiple types, and how type hints differ from runtime type checking.

Learn what yield means in Python and how it creates generator functions. Understand yield vs return, next(), for loops, generator expressions, yield from, and common mistakes with simple examples.

Learn how to build an RPM package in Linux using rpmbuild. Create the rpmbuild directory structure, write a SPEC file, build RPM from source, create RPM from scratch, and verify the package.

Learn how to write to a file in Python using with open(). Create a new file, overwrite an existing file, append data, write multiple lines, and avoid common file mode mistakes.

Learn how to use multiple conditions in a Python while loop using and, or, not, parentheses, and two-condition examples. Understand when the loop stops and how to avoid infinite loops.

Learn how to force Chrony time sync in Linux using chronyc makestep and chronyd -q. Also configure Chrony as an NTP client or server, check sync status, and understand server options like iburst, minpoll, and maxpoll.

Fix Too many open files (EMFILE) and set ulimit-style nofile, nproc, and file size limits in Kubernetes pods using a prlimit or ulimit entrypoint—separate from CPU and memory resources.limits, with Pod examples you can …

We can add a limit (quota) to different Kubernetes resources such as CPU, memory, hugepages for containers. We can restrict a soft and hard limit to these resources

Understand various terminologies with linux memory management, dirty page, swapping, inactive, active memory, Translation Lookaside Buffers (TLB), page cache

Step-by-Step instructions to disable transparent hugepages GRUB2 using grub2-editenv in RHEL/CentOS 8 Linux. Check transparent huge pages status (AnonHugePages)

Step-by-Step Tutorial to configure hugepages in red hat and centos 7/8 linux using vm nr_hugepages in /etc/sysctl.conf. Also configure hugepages pool using hugeadm

Learn how to check Transparent HugePages in Linux, verify if THP is enabled or disabled, understand AnonHugePages vs static hugepages, and find per-process THP usage.

Learn how to check if CPU supports HugePages with 2MB and 1GB Size in CentOS/RHEl 7 Linux and change default hugepage size permanently using GRUB2 with examples

What are transparent huge pages? How to check turn off disable transparent hugepages in RHEL / CentOS 7 Linux for this session or permanently sysctl GRUB2?

Compare HugePages (static HugeTLB) and Transparent HugePages in Linux: what each is, when to use or disable them, how to check and configure them, how Kubernetes exposes hugepages-2Mi and hugepages-1Gi, and how to …

Free Kubernetes tutorial that takes you from cluster install to CKA/CKAD-level topics - pods, deployments, RBAC, networking, Helm, security, autoscaling. 50+ hands-on lessons across 13 chapters, every example tested on …