Author:
erics, Posted on Thursday, July 8th, 2021 at 9:21:10pm
ERROR: Briefly Unavailable for Scheduled Maintenance. Check Back in a Minute
CAUSE: WordPress did not complete an action
SOLUTION: Either
– remove ~/wordpress/.maintenance
– edit ~/wordpress/wp-activate.php and set define( 'WP_INSTALLING', false );
Categories: How-To's, Technology Tags: howto, Hung, Maintenance, Stuck, tips, WordPress, WP_INSTALLING | 
No comments
Author:
erics, Posted on Thursday, June 17th, 2021 at 12:45:23pm
To update your git user name and email address for all repos:
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git config --global user.name "Your Name" git config --global user.email "yourName@theDomain.com" |
To update your git user name and email address for a specific repo:
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cd repo git config user.name "Your Name" git config user.email "yourName@theDomain.com" |
Categories: How-To's, Technology Tags: Change, Email, git, Global, howto, local, name, Repo, repository, tips, user.email, user.name | No comments
Author:
erics, Posted on Wednesday, June 16th, 2021 at 12:19:06pm
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my $needle = 'foo'; my $haystack = 'foo foo foo'; my @count = $haystack =~ /$needle/g; my $count = scalar @count; print "$count\n"; |
Should result in 3
Categories: How-To's, Technology Tags: Count, HayStack, howto, Needle, perl, Scalar, String, tips | No comments
Author:
erics, Posted on Thursday, June 10th, 2021 at 4:14:53pm
Search for a string:
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apt-cache search {LOOKING_FOR} |
List all packages:
Categories: How-To's, Technology Tags: aapt-cache, APT, apt-get, Available, Install, Linux, Package, search | No comments
Author:
erics, Posted on Thursday, June 10th, 2021 at 1:19:03pm
I wanted to change instance type from t2 to t3, but got an error when i went to start the instance:
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An error occurred (InvalidParameterCombination) when calling the StartInstances operation: Enhanced networking with the Elastic Network Adapter (ENA) is required for the 't3.large' instance type. Ensure that your instance 'i-04ae4c6f7bfa96e51' is enabled for ENA. |
I found this AWS docs page: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-ena.html
Below are the steps I need to follow on AWS Linux 1.
Summary Steps
Pre-flight tests on t2
modinfo ena
-> see “ERROR: modinfo: could not find module ena”
ethtool -i eth0 | grep ^driver:
-> see “driver: vif”
Install the latest drivers
sudo yum -y update
sudo reboot
modinfo ena | grep ^description:
-> see “description: Elastic Network Adapter (ENA)”
Convert the instance to t3 to get ENA working
aws ec2 stop-instances --instance-ids {instanceid}
aws ec2 modify-instance-attribute --instance-id {instanceid} --instance-type t3.large
aws ec2 start-instances --instance-ids {instanceid}
ethtool -i eth0 | grep ^driver:
-> see “driver: ena”
Detailed Steps
Ensure the latest drivers are installed:
sudo yum -y update
IMPORTANT: You must reboot once the updates are done!
After the reboot, check to ensure the driver is loaded properly:
modinfo ena
DRIVER NOT INSTALLED
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ERROR: modinfo: could not find module ena |
DRIVER INSTALLED √
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filename: /lib/modules/4.14.232-123.381.amzn1.x86_64/kernel/drivers/amazon/net/ena/ena.ko version: 2.4.0g license: GPL description: Elastic Network Adapter (ENA) author: Amazon.com, Inc. or its affiliates srcversion: A0EBAF712C13F1157615C85 alias: pci:v00001D0Fd0000EC21sv*sd*bc*sc*i* ... |
Enable ENA on the instance
aws ec2 modify-instance-attribute --instance-id {instanceid} --ena-support
Note: To disable ENA support, use this command:
aws ec2 modify-instance-attribute --instance-id {instanceid} --no-ena-support
Check that it is enabled
aws ec2 describe-instances --instance-ids {instanceid} --query "Reservations[].Instances[].EnaSupport"
You should see the string ‘True’ as the result when enabled, and nothing when disabled.
Stop the instance so you can change the instance type.
aws ec2 stop-instances --instance-ids {instanceid}
Change instance type from t2 to t3
aws ec2 modify-instance-attribute --instance-id {instanceid} --instance-type t3.large
Start the instance
aws ec2 start-instances --instance-ids {instanceid}
Check the interface
ethtool -i eth0
DRIVER NOT INSTALLED
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driver: vif version: firmware-version: bus-info: vif-0 supports-statistics: yes supports-test: no supports-eeprom-access: no supports-register-dump: no supports-priv-flags: no |
DRIVER INSTALLED √
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driver: ena version: 2.4.0g firmware-version: bus-info: 0000:00:05.0 supports-statistics: yes supports-test: no supports-eeprom-access: no supports-register-dump: no supports-priv-flags: no |
NOTE: As per the AWS docs -> “The following AMIs include the required ENA module and have ENA support enabled: Amazon Linux 2”
Categories: How-To's, Technology Tags: AWS, AWS Linux, AWS Linux 1, Family, howto, Instance, Instance Family, Instance Type, Linux, t2, t3, tips, Type | No comments
Author:
erics, Posted on Tuesday, June 8th, 2021 at 11:11:18am
shell> git merge branch-with-messy-changes
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Auto-merging myCode.pm CONFLICT (content): Merge conflict in myCode.pm Automatic merge failed; fix conflicts and then commit the result. |
shell> git status
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On branch eric-merge Your branch is up to date with 'origin/eric-merge'. You have unmerged paths. (fix conflicts and run "git commit") (use "git merge --abort" to abort the merge) Changes to be committed: Unmerged paths: (use "git add <file>..." to mark resolution) both modified: myCode.pm |
shell> git merge --abort
shell> git status
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On branch eric-merge Your branch is up to date with 'origin/eric-merge'. nothing to commit, working tree clean |
IMPORTANT NOTE: Previous versions of git used different commands for this operation:
Latest version: git merge --abort
Older than version 1.7.4: git reset --merge
Older than version 1.6.2: git reset --hard
Categories: How-To's, Technology Tags: abort, conflict, git, howto, Merge, Revert, tips, Undo | No comments
Author:
erics, Posted on Wednesday, May 26th, 2021 at 3:32:31pm
https://dev.mysql.com/doc/mysql-shell/8.0/en/mysql-shell-output-formats.html
Multiple Formats Available:
Table Format – use --result-format=table, alias --table
Tab Separated Format – use --result-format=tabbed, alias --tabbed
Vertical Format – use --result-format=vertical, alias --vertical
JSON Format Output – use --result-format=VALUE, alias --json[=pretty|raw|off]
VALUE may be one of:
- json or json/pretty – These options both produce pretty-printed JSON.
- ndjson or json/raw – These options both produce raw JSON delimited by newlines.
- json/array – This option produces raw JSON wrapped in a JSON array.
Categories: How-To's, Technology Tags: --tabbed, cli, Format, mysql, output, Plain, Table, Vertical | No comments
Author:
erics, Posted on Friday, April 23rd, 2021 at 11:30:23am
Ever get the spinning beachball when trying to access the top menu on your Mac?
SOLUTIONS
Use the GUI
Open the Activity Monitor application
Select All Processes from the View menu
Click on the SystemUIServer process, then click Force Quit.
~or~
Via CLI
In Terminal, execute killall SystemUIServer
Categories: How-To's, Technology Tags: Activity Monitor, All Processes, apple, BeachBall, Force, Force Quit, Hang, Hung, Kill, killall, killall SystemUIServer, Mac, MacOS, macosx, Menu, Quit, Restart, Shell, Spiining beachball, Stop, SystemUIServer, Terminal, Top Menu | No comments
Author:
erics, Posted on Friday, April 16th, 2021 at 3:07:24pm
The key is to define a variable first, then use the BEGIN block to initialize the variable, then reference the variable in use lib $var; later on ;-}
For example, enable a module contained in the same directory as a script called via the PATH:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 |
#!/ussr/bin/env perl use strict; use warnings; our $scriptPath; BEGIN { eval { use File::Basename; use File::Spec; $scriptPath = dirname(File::Spec->rel2abs(__FILE__)); 1; } or do { die "$0 use CRASHED: $@"; }; } use lib $scriptPath; eval { use MyModule::ABC; 1; } or do { die "$0 use CRASHED: $@"; }; |
Categories: How-To's, Technology Tags: @INC, compile, Compile-time, Dir, directory, howto, include, lib, Library, module, Path, perl, require, Run-time, runtime, tips, Use, use lib | No comments
Author:
erics, Posted on Monday, March 22nd, 2021 at 2:32:54pm
Ah, the power of grep!
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mysql --help | grep 'Default options' -A 1 |
Categories: How-To's, Technology Tags: howto, my.cnf, mysql, tips | No comments
