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The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key

 W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://packages.sury.org/php buster InRelease: The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <[email protected]> W: Failed to fetch https://packages.sury.org/php/dists/buster/InRelease  The following signatures were invalid: EXPKEYSIG B188E2B695BD4743 DEB.SURY.ORG Automatic Signing Key <[email protected]> W: Some index files failed to download. They have been ignored, or old ones used instead. To fix this problem use these commands: apt-get update apt-get -y install lsb-release ca-certificates curl curl -sSLo /tmp/debsuryorg-archive-keyring.deb https://packages.sury.org/debsuryorg-archive-keyring.deb dpkg -i /tmp/debsuryorg-archive-keyring.deb sh -c 'echo "deb [signed-by=/usr/share/keyrings/deb.sury.org-php.gpg] https://packages.sury.org/php/ $(lsb_release -sc) main" > /et
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Docker network not found

 Docker network not found   Failed to remove network <id>: Error response from daemon: network <id> not foundFailed to remove some resources from stack: <name> When using docker network ls, the network is indeed not removed, however, docker network rm <id> always results in the following: Error response from daemon: network <id> not found 1. If you are attempting to add a container to an existing network that no longer exists, then you can use docker-compose up --force-recreate.  2. Inspect the network which we are unable to delete docker network inspect <id> or <name> Disconnect the network docker network disconnect -f <networkID> <endpointName> or <endpointId> Delete unused networks docker network prune docker system prune will remove 'all networks not used by at least one container' allowing them to be recreated next docker-compose up
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Postfix/sendmail fatal: User nginx is not allowed to submit mail

Postfix/sendmail fatal: User nginx is not allowed to submit mail   You need to edit /etc/postfix/main.cf    and find   authorized_submit_users = root,www-data   and add nginx.   After that reload postfix and now you can send emails from web php forms.
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Installing megacli and megaclisas-status on Proxmox PVE 7.4 and Proxmox Backup Server 2.4-3

 Installing megacli and megaclisas-status on Proxmox PVE 7.4 and Proxmox Backup Server 2.4-3   1. Edit sources   vi /etc/apt/sources.list # LSI MegaRaid Tools deb http://hwraid.le-vert.net/debian bullseye main 2. Import key wget https://hwraid.le-vert.net/debian/hwraid.le-vert.net.gpg.key apt-key add hwraid.le-vert.net.gpg.key 3. Install megaraid tools apt update apt install megacli apt install megaclisas-status     4. Check status megacli -AdpAllInfo -aAll or  megaclisas-status or smartctl -a -d megaraid,6 /dev/sdb  
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Proxmox LXC cannot mount squashfs image using "squashfs" mount

 Proxmox LXC cannot mount squashfs image using "squashfs" mount   error: system does not fully support snapd: cannot mount squashfs image using "squashfs": mount: /tmp/sanity-mountpoint-015619550: mount failed: Operation not permitted.   1. Enable FUSE  go to CT ->  Options -> Features and click the FUSE checkbox. 2. Install squashfs tools and others dnf install squashfs-tools squashfuse fuse 3. reboot LXC container You can install now ex certbot snap install --classic certbot
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Send emails from postfix using mandrill or sendgrid

 Send emails from postfix using mandrill or sendgrid After installing and configuring postfix, add this to the /etc/postfix/main.cf relayhost = [smtp.sendgrid.net]:2525 smtp_tls_security_level = encrypt smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd header_size_limit = 4096000 smtp_sasl_security_options = noanonymous or relayhost = [smtp.mandrillapp.com]:587 smtp_tls_security_level = encrypt smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd header_size_limit = 4096000 smtp_sasl_security_options = noanonymous   Create file /etc/postfix/sasl_passwd   and add inside     [ smtp.sendgrid.net ] :587 USERNAME:PASSWORD   or [ smtp.mandrillapp.com ] :587 USERNAME:API_KEY   Protect the files changing to DB: postmap /etc/postfix/sasl_passwd     now you can delete sasl_passwd because there is sasl_passwd.db file   If there is error: postfix/smtp[8513]: warning: SASL authentication failure: No worthy mechs found postfix/smtp[85
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Reduce (shrink) and resize raw disk at Proxmox

 Reduce (shrink) and resize raw disk at Proxmox 1. Check the status of raw disk:   #e2fsck -fy /hdd-img/images/111/vm-111-disk-1.raw e2fsck 1.46.5 (30-Dec-2021) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /hdd-img/images/111/vm-111-disk-1.raw: 135279/327680000 files (1.8% non-contiguous), 857599886/1310720000 blocks  2. At first, check raw disk size:   #qemu-img info /hdd-img/images/111/vm-111-disk-1.raw image: /hdd-img/images/111/vm-111-disk-1.raw file format: raw virtual size: 4.88 TiB (5368709120000 bytes) disk size: 3.59 TiB  3. Resize filesystem: -M - will resize to the minimum size based on saved files -p - will display progress bar #resize2fs -M -p /hdd-img/images/111/vm-111-disk-1.raw resize2fs 1.46.5 (30-Dec-2021) Resizing the filesystem on /hdd-img/images/111/vm-111-disk-1.raw to 852166716 (4k) blocks. Begin pass 2 (max = 196
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