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Elasticsearch Error: Format version is not supported

When I downgraded Elasticsearch 7.10 to 7.6, I was not able to restart the elasticsearch service and was facing these errors: and  “Format version is not supported” After diagnosing the issue and going through a number of web URLs, I come to know that the following line in the elasticsearch.yml file will fix my issue. cluster.initial_master_nodes: ["x.x.x.x"] OR  cluster.initial_master_nodes:  master - node - a     I hope it will help someone and save their time too. Thanks!!! Enjoy Programming!! :)
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ElasticSearch 7.x not working after upgrade

In case you have upgraded elastic search by mistake and want to rollback to the previous working version, here are the steps. In my case, I upgraded the ElasticSearch to 7.9.2-1 and wanted to rollback to 7.6.2-1 1. yum downgrade elasticsearch-7.6.2-1 2. Restart elasticsearch sudo service elasticsearch start I hope it will work but in case you are facing any of the following issues, please run respective comments. Errors: Problem . Unable to create temporary keystore at [/etc/elasticsearch/elasticsearch.keystore.tmp] Solution : sudo -u elasticsearch -s /usr/share/elasticsearch/bin/elasticsearch-keystore create Problem : Likely root cause: java.nio.file.AccessDeniedException: /etc/elasticsearch Solution : chmod g+w /etc/elasticsearch Thanks!! Enjoy Programming! Reference Links ==================================== https://discuss.elastic.co/t/unable-to-create-temporary-keystore-at-etc-elasticsearch-elasticsearch-keystore-tmp/136411

SSL(Self-Signed) Certificates are working fine on Firefox and Safari, but not on Chrome

Yesterday, I implemented self-signed SSL certificates to one of my websites, and to my surprise https link was working as expected on Safari and Firefox, but not on the Chrome browser. I was getting the following error: With this, I connected with my IT team and come to know that, the certificates are not generated properly. All the browsers support different SSL expiry dates and we had to raise requests again to generate SSL Certificates for a minimum duration which was of 398 days (Apple) so that it can support all the browsers and new certificates worked without any issue. Edit: 28-09-2020 Looks like all the  Browser developers   — such as Google, Apple, Microsoft, and Mozilla have agreed to keep the SSL Certificate Lifespan common - 398 days. Please read more about it here: https://securityboulevard.com/2020/07/mozilla-cuts-ssl-certificate-lifespans-keyfactor Thanks!! Enjoy Programming!! :)

Odoo: Qweb Templates Cache Issue

Hi Everyone, Today I was working on a hotel booking template in Odoo and changes made in the Qweb template(.xml) were not reflecting on updating module with odoo service restart. Tried few times without any success :(. Finally, I decided to delete the old template from Odoo backend and then update module again and it worked like a charm!! :) Steps to delete template from backend: Settings --> User Interface --> Views --> Search by template name Delete the used template. Although it's a small post, but I'm sure it will meet the purpose and help someone in the future. Thanks!!! Enjoy Programming!! :) Reference Links: =================================== https://www.odoo.com/forum/help-1/question/odoo-cache-and-updating-qweb-templates-84492

RHEL/CentOS 8 docker-ce installation Error: package docker-ce-3:19.03.8-3.el7.x86_64 requires containerd.io >= 1.2.2-3

If you are facing the error while installing docker-ce as follow: To fix it, you can either install a specific stable version like: $ sudo dnf install docker-ce-3:18.09.1-3.el7 OR you can force the installation of docker-ce with the --nobest option $ sudo dnf install --nobest docker-ce OR Install the latest available containerd.io package manually $ sudo dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm After the package is installed, we can simply install the latest docker-ce $ sudo dnf install docker-ce This option is less convenient since the containerd.io package is not installed as a dependency of docker-ce , therefore it will not be removed automatically when the latter is uninstalled from the system. I hope it will fix your issue!! Thanks!!!!!!! Enjoy Programming :) Reference Links =================================== https://linuxconfig.org/how-to-install-docker

RHEL/CentOS 8 Error: problem with installed package podman-docker

If you guys are facing an error while installing  Docker CE on Centos/RHEL 8 as follow: Here is the workaround For CentOS/RHEL: Uninstall podman before updating it  sudo yum -y remove podman  and install it back w/o manpages: # install all podman dependencies except podman-manpages sudo yum -y install oci-systemd-hook libvarlink Then again install docker-ce # install docker-ce sudo yum -y install docker-ce It should work this time! If still facing an issue, try to use --nobest flag with command $ sudo dnf -y install docker-ce --nobest Workaround for For Ubunutu: sudo apt install -o Dpkg::Options::="--force-overwrite" podman Thanks!!! Enjoy Programming :) Reference Links: ============================= https://github.com/containers/libpod/issues/4791#issuecomment-575124857

RabbitMQ server issue - vhost ‘/’ is down

I'm using RabbitMQ with Celery(Django) for the last couple of months now but recently we faced an unexpected issue where RabbitMQ is not accepting tasks in its queues and error in logs say: INTERNAL_ERROR — aess to prod_vhost ‘/’ refused for user ‘prod’: prod_vhost ‘/’ is down.` Now, how to solve this problem: From the Rabbitmq log file you can get the destination file URL, in my case it was /var/lib/rabbitmq/mnesia/rabbit@hostname_1/msg_stores/ prod_vhost /784WB90CIFDYO9LJI6DKMI78L/recovery.d ets” If you have problem with vhost '/', most probably the file url will be /var/lib/rabbitmq/mnesia/rabbit@hostname_1/msg_stores/vhosts/628WB79CIFDYO9LJI6DKMI09L/recovery.d ets” Resolution : Stop 'rabbitmq-server'. delete the folder that contains the corrupt files. In this case: 784WB90CIFDYO9LJI6DKMI78L Start 'rabbitmq-server'. It should work fine now.   Thanks!!! Enjoy Programming!!!!!!! :) Reference Link: htt