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    Deploy a Production Ready Kubernetes Cluster With lxc Container and Kubespray

    Deploy a Production Ready Kubernetes Cluster With lxc Container and Kubespray

    I am going to show the workground how you can use lxc container to create a production grade cluster. Though its hard to create kubernetes cluster with lxc container but its possible. So lets see how we can solve all of those challenges step by step

    Step 1: Prepare host machine

    a) edit following file

    nano /etc/sysctl.conf
    # Uncomment the next line to enable packet forwarding for IPv4


    b) disable firewall 

    ufw disable


    c) disable swap

    swapoff -a; sed -i '/swap/d' /etc/fstab


    d) update sysctl settings for kubernetes networking

    cat >>/etc/sysctl.d/kubernetes.conf<<EOF
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    sysctl --system


    Step 2: Create lxc profile

      boot.autostart: "true"
      linux.kernel_modules: ip_vs,ip_vs_rr,ip_vs_wrr,ip_vs_sh,ip_tables,ip6_tables,netlink_diag,nf_nat,overlay,br_netfilter,nf_conntrack,xt_conntrack
      raw.lxc: |
        lxc.apparmor.profile=unconfined sys:rw cgroup:rw
      security.nesting: "true"
      security.privileged: "true"
    description: Default LXD profile
        name: eth0
        network: lxdbr0
        type: nic
        path: /
        pool: default
        type: disk
    name: microk8s
    - /1.0/instances/node1
    - /1.0/instances/node2
    - /1.0/instances/node3


    Step 3: Create a linux container 

    lxc launch -p default -p microk8s ubuntu:21.04 node1


    Step 4: Inside container do following 

    a) following command should return output

    conntrack -L
    modinfo overlay


    b) if above command output error then its seems that there some karnel related problem. Install and fix karnel issue

    sudo apt install linux-generic
    sudo apt install --reinstall linux-image-$(uname -r);
    sudo apt install --reinstall linux-modules-$(uname -r);
    sudo apt install --reinstall linux-modules-extra-$(uname -r);

    this should fix karnel related issue.


    c) Recent kubernetes versions want to read from /dev/kmsg which is not present in the container. You need to instruct systemd to always create a symlink to /dev/console instead:

    echo 'L /dev/kmsg - - - - /dev/null' > /etc/tmpfiles.d/kmsg.conf

    if it not working then run following

    echo 'L /dev/kmsg - - - - /dev/console' > /etc/tmpfiles.d/kmsg.conf


    if it still not work then do following

    # Hack required to provision K8s v1.15+ in LXC containers
    mknod /dev/kmsg c 1 11
    echo 'mknod /dev/kmsg c 1 11' >> /etc/rc.local
    chmod +x /etc/rc.local


    d) if you need to load any module then you can run following comman

    # cmd    module name
    modprobe br_netfilter


    Thats all. Now follow the Kubespray official document.

    To access k8s cluster without execing into master node

    Download the kubectl command into your local.

    which kubectl
    # output: /usr/bin/kubectl

    Create .kube directory

    mkdir ~/.kube

    copy config from kmaster into .kube directory

    lxc file pull kmaster/etc/kubernetes/admin.conf ~/.kube/config
    #check cluster
    kubectl get nodes



    Maria , Kristina and
    31 more liked this

      How to Permanently Solve "Temporary failure in name resolution" Issue

      Permanently Solve Temporary Failure in Name Resolution Issue

      Sometimes we face issue like 

      kalyan@ubuntu:~$ ping
      ping: Temporary failure in name resolution


      We can easily solve the issue by editing /etc/resolv.conf  

      just add to the file 



      But the solution does not work when system reboot. 

      So lets solve permanently the problem. 

      Step 1: Install following lib

      sudo apt install resolvconf

      Step 2: edit following file

      nano /etc/resolvconf/resolv.conf.d/head

      add following record to the file



      now save and reboot the system. 

      Congratulation!! We solve the problem permanently.


      Jennifer , FinderBD and
      25 more liked this

        Prime Minister’s Education Trust Job Circular
        public Job
        Job Type: Full-time
        Salary: 35500 - 67010 tk. per month
        Application Deadline: 2021-01-13

        Applications are invited from genuine Bangladeshi nationals for direct appointment to the following posts in the Prime Minister's Education Assistance Trust.   Job summery at a glance - 


        Name of Organisation 

        Prime Minister’s Education Assistance Trust 

        Circular Publish Date 

        21st  December 2020 


        Official Website 

        Job Type 

        Government Job 

        Post Name 


        Number of Post 


        Nature of Job 

        Full time 


        35 years 

        Educational Qualification 

        As per circular 


        35500- 67010 

        Job Location 


        Official Website to Apply  or  


        13th Jan 2021 




        Tara , Fokrul and
        45 more liked this

          Department of Agricultural Extension Recruitment Circular
          public Job
          Job Type: Full-time
          Salary: 18300 - 19300 tk. per month
          Application Deadline: 2020-12-27

          কৃষি আবহাওয়া তথ্য পদ্ধতি উন্নতকরণ প্রকল্পের নিয়োগ বিজ্ঞপ্তি।


          Recruitment- Notification 
          summery at a glance -  

          Name of Organization 

          Department of Agricultural Extension-Government DAE

          Circular Publish Date 

          11 December 2020

          Job Type 

          Government Job 

          Number of Post 


          Nature of Job 

          Full time 


          From 18 to 30 years 

          Educational Qualification 

          As per circular 



          Official Website to Apply 


          27 Dec 2020

          Recruitment to the following posts on full temporary basis for the duration of the project "Agro-Climate Information System Improvement Project" being implemented by the Department of Agricultural Extension. Applications are invited from permanent citizens of Bangladesh for:

          Position NameEducational Qualifications and Experience
          Accountant 1 (one)Minimum Bachelor in Commerce from a recognised University. Must have knowledge of MS Word, Excel, PowerPoint to help with accounting. Experience in public procurement, government audit system, ADP and IDA finance system will be preferred. Must have at least 5 (five) years of experience in accounting or financing. The age limit is relaxed for the more experienced.

          Office Assistant

           1 (one)

          Minimum bachelor's degree from a recognised university. Must have experience in preparing letters, reports, other documents through MS Word, Excel, PowerPoint etc. Must have at least 2 (two) years experience in office secretarial work. The age limit is relaxed for the more experienced.



          Md suzan , Tara and
          29 more liked this

            Job circular at Ministry of Defense – 2020
            public Job
            Job Type: Full-time
            Salary: 8000 - 26000 tk. per month
            Application Deadline: 2021-01-04

            Ministry of Defense published a job circular and invited applicants to apply within 04 Jan 2021.  Job summary at a glance  

            Name of Organization 

            Ministry of Defence (MOD) 

            Circular Publish Date 

            12th December 2020 

            Job Type 

            Government Job 

            Number of Post 


            Nature of Job 

            Full time 


            From 18 to 30 years 

            Educational Qualification 

            As per circular 


            6 - 112 

            Official Website to Apply 



            04 Jan 2021 



            Apply Instruction:  
            Interested and Eligible Candidates will apply on-line. To use on-line follow the instruction below.  
            The application process very easy. You have to Fill- up the application form with the needed information.  
            First of all, visit and choose your Position.  


            Upload your Color photograph and Signature.  The photograph Size should 300×300-pixel, most 100kb, and JPG Format. The signature size should 300×80-pixel, most 60KB and JPG Format.  

            Then submit the application form. You will get the preview then download the applicant copy. 
            You should not apply on the last day of the job circular. Because the last date may not work properly. So, apply early to avoid any kinds of problems. To finish your application, you must have to pay the application fee. You can through telitalk mobile network by sending SMS. 

            Kalyan , Md suzan and
            39 more liked this

              Avoid all mistakes on the trip

              Usually Experienced tourists give advice on what to do or see during the trip. But what do you know about what not to do on the trip? Usually, any tourist makes several mistakes on the trip. 


              You may have to spend extra money for those mistakes or you may be wasting time or you may have missed a trip to a beautiful place. But by avoiding those mistakes, you can travel smart at a very low cost. Let's take a look at the things that should be avoided while traveling. 


              Do not take food from main tourist places 

              Usually, the price of food at a tourist main place is higher than any other place. When the restaurants realize that tourists may not come here a second time, they do not think much about the quality of the food. The farther you go from the tourist main place to the local restaurant, you'll find better local food at a lower cost. 


              Take travel insurance 

              While this may seem like an extra expense, accidents can happen at any time. You should be highly prepared for that. Travel insurance will protect you in case of loss of your hobby camera, injury to limbs, etc. 


              Also, if you face these problems without insurance, it can cost much extra money. So it is wise to take out travel insurance. 


              Do not exchange money at the airport 

              When you travel to another country, you have to exchange money. But never do that from the airport. Usually, the exchange rate is the lowest at the airports. 


              Exchange money from ATM or credit card. If that is not possible, do it from the nearest bank. You can exchange money at a very good rate from ATM or bank. 


              Taxi service should take less 

              Usually, the taxi service is more everywhere. However, this service can be taken if the rent can be shared with two or three people. So it is better to take public services for travel. 


              Hostel accommodation 

              Most people think the hostel is a very dirty, smelly environment that is chosen by relatively indigent travelers. It used to be like this but now it has changed a lot. Many hostels are much cleaner than hotels. You will also find hostels with various facilities including pool games, TV, laundry. Hostels are a good option for low-cost backpack travelers. 


              Not booking hotels and flights much earlier 

              The earlier a trip is booked, the more likely it is that the cost will increase. Apparently, you are being offered a discount on a flight or hotel shortly before the start of the trip but you cannot accept it because you have booked in advance. So wait for the offer. Understand the situation and book a hotel or flight at different times. 


              Go to the local tourist office 

              Go to the tourist office of the place you are traveling to. There you will find maps, guides or a good idea of where to stay. Their job is to help tourists. So go there and learn about the relevant information and various offers. 


              Usually, most of these mistakes are made by tourists which is a waste of money and time. You must keep such mistakes in mind while traveling and avoid them properly.


              Kalyan , Md and
              36 more liked this

                Tips to book a low-cost hotel for travel

                On the trip, we are all more or less worried about the hotel. How will the hotel be or not! Also, because of the high cost of good hotels, many people have to stay in low-quality hotels at low cost. If the hotel is not available as you like, then the pleasure of travel seems to be reduced. So, let's know, about some ways to book a hotel at a low cost. 


                Book from hotel booking site: 

                Many times different hotel booking sites announce different offers or discounts. Through this offer, you can also find a low-cost hotel between two hotels with the same quality and facilities. You can consider those hotel ratings to understand good or bad hotels. 

                Most hotel booking sites have facilities to find low-cost hotels. So you can try to find low-cost hotels from hotel booking sites. Agoda,, Trivago are among the most popular hotel booking sites. 


                Contact the hotel website directly: 

                If you are thinking of staying in a globally branded hotel, you can contact the website of those hotels directly. Usually, those hotels publish their offers on their own site. If you book directly in these hotels, you will get several benefits later. 

                For example, you will get loyalty points which will give you various benefits including discounts later on. That is why it is better to book these hotels directly by yourself than by any other medium. 


                negotiate with price: 

                Bargaining can reduce room costs. You can reduce the hotel room rent by bargaining by phone or by going directly to the hotel. Also in the off-season, you can get a room at a much lower cost. 


                Loyalty Rewards Program: 

                Different brands or mobile phone operators give loyalty points to their customers at different times. By accumulating these loyalty points you can get quite a good discount. Brands can use this loyalty program as travel deals. This will greatly reduce your hotel expenses on travel. 


                Using a bank card: 

                Many times different banks offer quite good discounts to their credit card customers during hotel bill payments. In a very luxurious hotel, you can halve the cost by paying with a bank card. So find out about such offers and try to use the card in bill payment. 


                Trying to buy someone else's reservation: 

                Sometimes it happens many people reserve hotel rooms but can't go for their business or various activities and they even cannot cancel the reservation. In such cases, many of them try to leave the reserve room at a low cost. So you can look for such offers from different sites and hotels. Try to accept any such offer. Your hotel costs will come down considerably. 


                Good quality and comfortable hotels are quite necessary to fully enjoy the trip. So follow the tips above and enjoy the trip better by reducing your hotel expenses. 


                Kalyan , Kaiser and
                35 more liked this

                  Adventure trips in the jungle and some tips

                  The forest is a very mysterious place. Since ancient times, the jungle has been inviting people with a mystery. Many tourists also like to travel in the forest. And adventurers spend several nights there to fully experience the jungle. 


                  There is no substitute for jungle travel to spend some uninterrupted time with nature. However, the jungle is relatively little dangerous for various wild animals. Therefore, some precautions should be taken. Let's take a look at some tips for jungle travel. 


                  Humid weather 

                  You will feel a lot of sweat here as the humidity is high in the forest. So always carry and wear dry clothes. Fabrics that dry quickly must be given priority. It also rains when in the forest. Wear fitting clothes and long-closed trousers. You will get as much relief from mosquito bites as possible. 


                  Hire a local guide 

                  No matter how brave you are, never forget to hire a local guide. Any kind of danger can come or you can get lost. In those cases, you will be quite comfortable with a guide. 


                  Keep quiet 

                  Maintain as much silence as possible in the forest. This will protect your own safety. Do not disturb the wild animals by making unnecessary noises and do not bring danger. 


                  Keep first aid, vaccine, and insecticide cream-lotion 

                  Keep with first aid as well as various insecticide creams-lotions or sprays. This is very important in jungle travel. Also, keep with some necessary medications and vaccines. In this case, you can take the advice of a doctor. 


                  Keep with caution device 

                  You may be isolated from the group or guide. Finding in such a big forest is not an easy task. So as a precaution you can keep it with a flute or any instrument. As a result, you can easily signal wherever you are. 



                  This is quite important in jungle travel. Your travel experience will depend a lot on what you take with you. There is no point in making a bag heavy with unnecessary things. Be sure to pack with essentials and enjoy your jungle trip. 



                  Try to take light colors on your clothes, bags, and everything. Some colors can attract wild animals or harmful insects from a distance. So use everything in elegant and jungle-friendly color combinations. 



                  Drink as much water as possible. Always keep with drinking water. Keep with dry food. Also, take safe food from the forest if you get the opportunity. 


                  Torch and knife 

                  Keep with the torch. Use a head torch if possible. This will make your trip to the forest easier. Also, keep a knife all the time. This will help you to avoid the bushes. You will also need a knife for various other needs. 


                  You can enjoy your time in the forest while maintaining safety and alertness as much as possible. Jungle trips should never be missed. Traveling through this jungle is one of the best ways to see nature. So if you get a chance, you can come and travel in the forest. 

                  Kalyan , Shaikh Ehsan and
                  42 more liked this

                    A land of modern architecture and absolute beauty

                    The 22nd richest country in the world, which was an underdeveloped third world country 40-50 years ago. That chaotic country, which gained independence in 1975, is one of the great attractions of the world today. I was talking about Singapore, one of the richest countries in the world today. Behind the success of the country lies economic success with good governance. No, the country has no natural resources, but its tourism industry has repeatedly garnered praise as well as economic prosperity. 


                    Singapore is a small island in Southeast Asia, a land of modern architecture and beauty. Clean roads, hassle-free travel, low-cost travel seem to have multiplied the tourist attraction several times over. It is better to take some time to visit one of the most luxurious countries in the world. 


                    Merlion is the name of the park, which is more than 2,000 square meters at the mouth of the Singapore River. Merlion Park is one of the most popular tourist spots in Singapore. Every day thousands of foreigners visit this park. 


                    The marlin or lion-fish is a symbol of Singaporean pride, a symbol of heroism. It is said that long ago when Singapore was known as Temasek or the seaside city, a severe sea storm arose on the island. The terrified inhabitants surrender themselves to God. At that moment, a lion-fish-like beast came from the sea and fought the storm and saved the inhabitants. 


                    And since then, the lion-fish named Marlin has been a symbol of pride and heroism of Singaporeans. The symbol of modern Singapore is the Marlion, a combination of a fish or a mermaid and a lion. The statue is about 9 meters high and weighs about 60 tons. 


                    The appearance of this Merlion is basically a huge water fountain. Marilyn Park on one side of the Marina Bay, Marina Bay Sands Hotel, and Shopping Center on the other side. This is a huge incident. If you don't see, it is difficult to explain. But before the Marina Bay Sands Hotel was built, tourists would take pictures in front of the fountain in Merlion Park to preserve their memories of Singapore. 


                    The statue of Marilyn is located in Merlion Park, Marina Bay. The lion-fish is constantly coming out of its mouth with water. And thousands of people gather there every day to take pictures. The huge area is cut off from one side of the park to the other. The various architectures around the park will dazzle your eyes again and again. 


                    Wonderful view all around. The road leads straight to a bunch of very tall buildings. To our right is the nearly 100-year-old giant building, the Hotel Fullerton Bay. In the midst of modernity, it is like a touch of tradition. However, it is not incongruous at all. And to the left is the huge Marina Bay Bay. Surrounded by gems, the monuments named after Singapore are scattered. 


                    The Marina Bay Sands Hotel, attached to the top of three 60-story buildings with a ship-shaped roof, made its presence felt as if it were a diamond in the rough. Along with the Marina Bay Sands Hotel, the Singapore Flyer was in full swing. 


                    Numerous large buildings of 5-star hotels were scattered along one side of the bay. These things were all around me as I watched the fountain in Merlion Park. It was also fun to see tourists traveling in various small and big boats across the bay. It is also worthwhile to take pictures of the tourists behind the fountain. 


                    When you come here, your eyes are fixed on a 54-story building. It's a museum. The shape of that thought is very beautiful. Seen from a distance, it seems that a large boat has been placed at the head of the building. Many people do not dare to go there as they have to pay USD 150 to get there. 


                    What to do in Marilyn Park 


                    1. Take pictures in Marilyn 

                    The place may be very crowded during the day but you can still take great pictures. But at night, do not miss the beauty of the magical environment of the city in any way. Don't forget to frame some beautiful views of Marilyn and the city 


                    2. Retire to the park 

                    The night is the perfect time to enjoy the beauty of Marilyn Park. The cool breeze and romantic atmosphere along the river will increase the success of the trip to Singapore several times. 


                    3. Watch the light and water show at Marina Bay 

                    Don’t miss the opportunity to watch the water show every night at Marina Sands Bay. The show has seemed a bit unfocused in recent episodes. So always keep your camera ready with several mesmerizing light show videos. 


                    How to get to Marilyn Park 

                    After you reach Changi, go to Raffles Place Station on the MRT East-West line. From there exit B and visit United Foreign Bank Plaza. The Fullerton Hotel is located in the middle of the plaza. And Marilyn is behind it. 

                    Miltan , Hasan and
                    45 more liked this

                      One day in Baraitali of unearthly beauty behind all the popular fountains

                      Many people visit Cox's Bazar or Bandarban in Bangladesh. These two spots are very popular with the tourists of the country. But there are many places around Cox's Bazar or Bandarban that are not very familiar to us. But in front of the beauty of these places, there is no ordinary tourist spot. 


                      Today we will know about Khaiyachara, Napittachara, Damtua with lesser-known waterfalls than these famous waterfalls. This spring is located at Naikhyangchhari on the border of Cox's Bazar and Bandarban. You have to cross about 10 kilometers of road to get back from this waterfall. Our writing today is about this fountain. 


                      If you want to go from Cox's Bazar, you can rent CNG or jeep and come to Naikhyangchhari. It takes about an hour to get here. Marine Drive or Ramu can come from any direction. It is easy to come here from Bandarban through Cox's Bazar. These two districts are separated by a small bridge. After crossing this bridge, the trail will start. 


                      In the dry season, the CNG can go quite a bit inside but in the rainy season, you have to start walking from the main road. There is a shop on the side of the road and a Buddhist shrine. You can leave your belongings here. You can also change clothes here. You can buy bamboo for walking from here. Be sure to take dry food and water with you, otherwise, it will be very difficult to go so far. 


                      First, go down a little bit then the straight road will continue to go up slowly. In this way, if you walk quite a bit, you will see Jhiri Path. If you want, you can take a tourist guide from here. 


                      However, as Myanmar is very close to here, drug smugglers often use this road, so be careful. The phone network is not available once you go inside, so you can let someone know in advance because the danger does not come by announcing. 


                      You can also walk along Jhiripath and you can walk along the dirt road. After a while, you will find a road quite bad. Excluding this road, you can take a detour through Jhiripath. Then the road straight for quite some time. 


                      After a while, the rocky road will start. Rough, dry rocks have to be walked carefully. Otherwise, there is a possibility of slipping on wet feet or if you fall, there may be big injuries. In some places of Jhiripath, the flow of water is quite strong. Carefully cross these places. 


                      It will take about one and a half to two hours to go. The closer you get to the main fountain, the bigger the waterfall will be. The combination of mountains and dense vegetation creates a dazzling beauty. There will be 3 small showers before the main shower. The space near the main fountain is quite small. It is not possible to stand more than 4-5 people at a time and the water pressure is also high. The water falling from above comes down with great speed. As such, the water pressure in the lower springs is less but the space is quite large. 


                      The main waterfall comes down from a high hill. Reaching the main fountain from the fountains below is a bit of a difficult task. But the cool water of the shower forgets all the troubles. Many brave trekkers want to climb the main waterfall hill but it is a very risky job. It is better not to take this risk unless you need to. 


                      It will take one and a half to two hours to return after seeing the fountain. However, it is less difficult to go on the way. Be sure to take care so that you can come back while the lights are on. When the light goes out, you will be in danger in this unknown place. 


                      Baraitali is the ideal place for those who love adventure. A place to visit in one day. If you go to Cox's Bazar, you can increase your time by one day and come back here. When you go out in the morning, you can take a walk around Marine Drive on the way back. 

                      FinderBD , Alamgir and
                      25 more liked this
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