MySphere Posts

I was installing the IBM MQ Server on a linux box yesterday. I got the error bellow:

[root@gateway MQServer]# dnf install rpm-build
Updating Subscription Management repositories.
Instana 14 B/s | 20 B 00:01
Errors during downloading metadata for repository ‘instana-agent’:

Status code: 401 for https://_:2NqBEofbQ8m9YcTpzTJEEg@packages.instana.io/agent/rpm/generic/x86_64/repodata/repomd.xml (IP: 34.253.98.124)
Error: Failed to download metadata for repo ‘instana-agent’: Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

Solution:

Delete the Instana Agent repo: rm /etc/yum.repos.d/Instana-Agent.repo
Clear dnf cache: dnf clean all
run dnf install rpm-build again

“I have lots of photo files. Since 2006, when I purchased my first digital camera, the number of photos has grown quickly, and after getting an iPhone, the number of photos exploded.

With the high number of photos, the number of backups grew as well.

I decided to organize all backups and create folders using the format YYYY-MM from the metadata of the photo files.”

Bellow the python script. The script runs on macos:

import os
import shutil
import datetime
import logging
import tkinter as tk
from tkinter import filedialog
from PIL import Image, ExifTags
import pillow_heif
import piexif
import struct

# Setup logging
logging.basicConfig(level=logging.DEBUG, format="%(asctime)s - %(levelname)s - %(message)s")

ATOM_HEADER_SIZE = 8
EPOCH_ADJUSTER = 2082844800  # Difference between Unix and QuickTime epoch

def get_file_date(file_path):
    try:
        if file_path.lower().endswith(".heic") and pillow_heif.is_supported(file_path):
            heif_file = pillow_heif.open_heif(file_path, convert_hdr_to_8bit=False)
            exif_data = heif_file.info.get("exif")
            if exif_data:
                exif_dict = piexif.load(exif_data)
                date_str = exif_dict["Exif"].get(piexif.ExifIFD.DateTimeOriginal)
                if date_str:
                    return datetime.datetime.strptime(date_str.decode("utf-8"), "%Y:%m:%d %H:%M:%S")
        
        elif file_path.lower().endswith((".jpg", ".jpeg")):
            with Image.open(file_path) as img:
                exif_data = img.getexif()
                if exif_data:
                    exif_dict = {ExifTags.TAGS.get(tag, tag): value for tag, value in exif_data.items()}
                    logging.debug(f"EXIF metadata for {file_path}: {exif_dict}")
                    
                    if "DateTimeOriginal" in exif_dict:
                        date_str = exif_dict["DateTimeOriginal"]
                    elif "DateTime" in exif_dict:
                        date_str = exif_dict["DateTime"]
                    else:
                        date_str = None
                        logging.warning(f"No DateTimeOriginal or DateTime found for {file_path}")
                    
                    if date_str:
                        try:
                            logging.debug(f"Extracted date string from EXIF: {date_str}")
                            return datetime.datetime.strptime(date_str, "%Y:%m:%d %H:%M:%S")
                        except ValueError as ve:
                            logging.error(f"Error parsing date for {file_path}: {ve}")
                    else:
                        logging.warning(f"DateTime metadata missing or unreadable for {file_path}")
                else:
                    logging.warning(f"No EXIF metadata found for {file_path}")
    
    except Exception as e:
        logging.error(f"Error extracting date from {file_path}: {e}")
    
    # If metadata exists but could not be parsed, use file birth time (creation date on macOS)
    file_stats = os.stat(file_path)
    file_birth_time = file_stats.st_birthtime
    logging.debug(f"Using file birth time for {file_path}: {datetime.datetime.fromtimestamp(file_birth_time)}")
    return datetime.datetime.fromtimestamp(file_birth_time)

def move_files_to_folders(source_folder):
    for filename in os.listdir(source_folder):
        file_path = os.path.join(source_folder, filename)
        if filename.lower().endswith((".jpg", ".jpeg", ".heic", ".mov")):
            date_taken = get_file_date(file_path)
            if date_taken:
                folder_name = date_taken.strftime("%Y-%m")
            else:
                logging.warning(f"Could not determine date for {file_path}, using 'unknown' folder.")
                folder_name = "unknown"
            
            dest_folder = os.path.join(source_folder, folder_name)
            os.makedirs(dest_folder, exist_ok=True)
            
            dest_file_path = os.path.join(dest_folder, filename)
            count = 1
            while os.path.exists(dest_file_path):
                name, ext = os.path.splitext(filename)
                dest_file_path = os.path.join(dest_folder, f"{name}_{count}{ext}")
                count += 1
            
            shutil.move(file_path, dest_file_path)
            logging.info(f"Moved {filename} to {dest_folder}")

if __name__ == "__main__":
    root = tk.Tk()
    root.withdraw()
    folder_selected = filedialog.askdirectory(title="Select the folder containing files")
    if folder_selected:
        move_files_to_folders(folder_selected)
        logging.info("File organization complete.")
    else:
        logging.warning("No folder selected.")

I set up an OpenShift 4.16 cluster using UPI on top of VMware. The cluster has 3 Masters, 3 Worker Nodes, and 3 InfraNodes. The infra nodes were necessary to install IBM Storage Fusion.

After the setup, I needed to create a load balancer in front of the OpenShift cluster. There are several options, and one of them is HAProxy.

I just installed an RHEL 9 server, added 3 ips to the network card and setup the haproxy.

Prerequisites

• A system running RHEL 9
• Root or sudo privileges
• A basic understanding of networking and load balancing

Step 1: Install HAProxy

First, update your system packages:

sudo dnf update -y

Then, install HAProxy using the package manager:

sudo dnf install haproxy -y

Verify the installation:

haproxy -v

Step 2: Configure HAProxy

The main configuration file for HAProxy is located at /etc/haproxy/haproxy.cfg. Open the file in a text editor:

sudo nano /etc/haproxy/haproxy.cfg

The configuration bellow was used for my cluster. Change the IP adresses to match

#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    # to have these messages end up in /var/log/haproxy.log you will
    # need to:
    #
    # 1) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # 2) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log
    #
    log         127.0.0.1 local2

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon

    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats

    # utilize system-wide crypto-policies
    #ssl-default-bind-ciphers PROFILE=SYSTEM
    #ssl-default-server-ciphers PROFILE=SYSTEM

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode                    tcp
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------

frontend api
    bind 192.168.252.171:6443
    default_backend controlplaneapi

frontend apiinternal
    bind 192.168.252.171:22623
    bind 192.168.252.171:22624
    default_backend controlplaneapiinternal

frontend secure
    bind 192.168.252.170:443
    default_backend secure

frontend insecure
    bind 192.168.252.170:80
    default_backend insecure

#---------------------------------------------------------------------
# static backend
#---------------------------------------------------------------------

backend controlplaneapi
    balance source
    server master-01  192.168.252.5:6443 check
    server master-02  192.168.252.6:6443 check
    server master-03  192.168.252.7:6443 check


backend controlplaneapiinternal
    balance source
    server master-01  192.168.252.5:22623 check
    server master-02  192.168.252.6:22623 check
    server master-03  192.168.252.7:22623 check
    server master-01  192.168.252.5:22624 check
    server master-02  192.168.252.6:22624 check
    server master-03  192.168.252.7:22624 check

backend secure
    balance source
    server worker-01  192.168.252.8:443 check
    server worker-02  192.168.252.9:443 check
    server worker-03  192.168.252.10:443 check
    server  worker-04   192.168.252.11:443 check
    server  worker-05   192.168.252.12:443 check
    server  worker-06   192.168.252.13:443 check

backend insecure
    balance roundrobin
    server worker-01  192.168.252.8:80 check
    server worker-02  192.168.252.9:80 check
    server worker-03  192.168.252.10:80 check
    server worker-04   192.168.252.11:80 check
    server worker-05   192.168.252.12:80 check
    server worker-06  192.168.252.13:80 check

When you delete a node using the CLI, the node object is deleted in Kubernetes, but the pods that exist on the node are not deleted. Any bare pods not backed by a replication controller become inaccessible to OpenShift Container Platform. Pods backed by replication controllers are rescheduled to other available nodes. You must delete local manifest pods.

• To delete the node from the UPI installation, the node must be firstly drained and then marked unschedulable prior to deleting it:
  
  

$ oc adm cordon <node_name>
$ oc adm drain <node_name> --force --delete-local-data --ignore-daemonsets
- Ensure also that there are no current jobs/cronjobs being ran or scheduled in this specific node as the draining does not take it into consideration.
- For Red Hat OpenShift Container Platform 4.7+, utilize the option `--delete-emptydir-data` in case `--delete-local-data` doesn't work. The `--delete-local-data` option is deprecated in favor of `--delete-emptydir-data`.

$ oc get node <node_name> -o yaml > backupnode.yaml

Before proceeding with deletion of the node, it needs to be under "power off" status:
$ oc delete node <node_name>

Although the node object is now deleted from the cluster, it can still rejoin the cluster after reboot or if the kubelet service is restarted. To permanently delete the node and all its data, you must decommission the node once it is in shutdown mode.

Once the node is deleted, it can be ready for a power-off activity, or if it is needed to rejoin the cluster, it could be possible to either restart the kubelet or create the yaml back:

$ oc create -f backupnode.yaml

In order to get the node back, it can also be back by restarting kubelet:

$ systemctl restart kubelet

If it is needed to destroy then all the data from the worker node to delete all the software installed, execute the following:

# nohup shred -n 25 -f -z /dev/[HDD]
This command will overwrite all data on /dev/[HDD] repeatedly, in order to make it harder for even very expensive hardware probing to recover the data. Command line parameter -z will overwrite this device with zeros at the end of cycle to re-write data 25 times (it can be overridden with -n [number]).

One should consider running this command from RescueCD.

In order to monitor the deletion of the node, get the kubelet live logs:

$ oc adm node-logs <node-name> -u kubelet

https://access.redhat.com/solutions/4976801