DEV Community: Peter Lau

MongoDB |> server selection error: server selection timeout Type: ReplicaSetNoPrimary

Peter Lau — Tue, 01 Sep 2020 18:00:07 +0000

Get a wired error message:

error connecting to host: could not connect to 
server:server selection error: server selection timeout, 
current topology: { Type: ReplicaSetNoPrimary, Servers: 
[{ Addr: admin:27017, Type: Unknown, State: Connected, 
Average RTT: 0, Last error: connection() : dial tcp: 
lookup admin: no such host }, ] }

when using mongoimport command.

Fix that by adding argument --uri

Example:

mongoimport 
    --uri "mongodb://<username>:<password>@
<ip or domain>:<port>/?authSource=
<authSource>&authMechanism=SCRAM-SHA-1" 
    -d <db> -c <collection> 
    --file=./data.json

Maybe also works with mongo and mongoexport

References:

https://stackoverflow.com/questions/59413297/error-connecting-to-host-could-not-connect-to-server-server-selection-error-s

Can markdown of dev.to do this ?

Peter Lau — Sun, 30 Aug 2020 13:44:19 +0000

❓ wrap line in code (manually wrap) 🔙

error connecting to host: could not connect to 
server:server selection error: server selection timeout, 
current topology: { Type: ReplicaSetNoPrimary, Servers: 
[{ Addr: admin:27017, Type: Unknown, State: Connected, 
Average RTT: 0, Last error: connection() : dial tcp: 
lookup admin: no such host }, ] }

✅ support strikethrough 🔙

~~Strikethrough~~ (❗️ no space between text)

~~Strikethrough~~

✅ support table 🔙

First Header | Second Header
------------ | -------------
Content from cell 1 | Content from cell 2
Content in the first column | Content in the second column

First Header	Second Header
Content from cell 1	Content from cell 2
Content in the first column	Content in the second column

✅ support emoji 🔙

:warning:
⚠️
THAKS reply

CLI |> Compress and Decompress via CLI

Peter Lau — Fri, 28 Aug 2020 04:09:18 +0000

IF YOU JUST SOLVED SOME PROBLEM, WELCOME TO DM qaRabbit ON TWITTER, OR CREATE A PULL REQUEST IN GITHUB REPO.

macOS

file.zip

extract to the current directory

unzip file.zip

extract to the target directory

unzip file.zip -d target_dir_path

compress to file.zip

zip file path1 path2 path3
file.tar (archive, no compress)

extract to the current directory

tar -xvf file.tar

extract to target_dir_path (must be created first)

mkdir -p target_dir_path && tar -C target_dir_path -xvf file.tar

compress path

tar -cvf file.tar path1 path2
file.tar.gz file.tgz

tar.gz file is a Tar archive compressed with Gzip

extract to the current directory

tar -zxvf file.tar.gz

extract to target_dir_path (must be created first)

mkdir -p target_dir_path && tar -C target_dir_path -zxvf file.tar.gz

compress path

tar -czvf file.tar.gz path1 path2 ...

compress with exclude

tar -czvf file.tar.gz path --exclude=sub_path1 --exclude=sub_path2

tar -czvf file.tar.gz path --exclude={sub_path1, sub_path2}

tar -czvf file.tar.gz path --exclude=*.ext
file.tar.xz

tar.gz file is a Tar archive compressed with Xz a LZMA based compress algorithm

tar auto-detects compression type and extracts the archive

tar -xf file.tar.xz
file.tar.bz2 file.tbz

tar.bz2 file is a Tar archive compressed with Bzip2

extract to the current directory

tar -xvf file.tar.bz2

extract to target_dir_path (--directory, -C; must be created first)

mkdir -p target_dir_path && tar -xvf file.tar.bz2 -C target_dir_path

extract specific files

tar -xf archive.tar.bz2 file1 file2 dir1 dir2

tar -xf archive.tar.bz2 --wildcards '*.md'

extract from stdin

wget -c ftp://ftp.vim.org/pub/vim/unix/vim-8.1.tar.bz2 -O - | sudo tar -xj

list archive content (--list, -t)

tar -tvf file.tar.bz2

compress path

tar -cjvf file.tar.bz2 path1 path2

GNU/Linux

References:

Build X from source is so hard 😭

Peter Lau — Thu, 27 Aug 2020 18:02:31 +0000

Default Version: latest

On Ubuntu 18.04:

servo ❌

servo / servo

The Servo Browser Engine
lumen ❌

lumen / lumen

An alternative BEAM implementation, designed for WebAssembly
tensorbase ❌

tensorbase / tensorbase

TensorBase is building a modern big data warehouse with performance in its core mind.

On macOS Catalina (Version 10.15.5)

Emacs27 ✅

d12frosted / homebrew-emacs-plus

Emacs Plus formulae for the Homebrew package manager

MongoDB |> How to Select a Single Field for All Documents in a MongoDB Collection

Peter Lau — Thu, 27 Aug 2020 17:56:29 +0000

db.inventory.find( { type: 'food' }, { item: 1, qty: 1 } )

In above example from the folks at Mongo, the returned documents will contain only the fields of item, qty, and _id.

db.inventory.find( { type: 'food' }, { item: 1, qty: 0 } )

In above example from the folks at Mongo, the returned documents will contain only the fields of item, and _id.

References:

Hugo |> Dev Server Open Browser

Peter Lau — Thu, 27 Aug 2020 16:26:59 +0000

IF YOU JUST SOLVED SOME PROBLEM, WELCOME TO DM qaRabbit ON TWITTER, OR CREATE A PULL REQUEST IN GITHUB REPO.

Why hugo dev server can't open browser tab automatically?

Modify hugo source code will definitely solve this issue.

Or we can use two simpler ways:

use some program to run command hugo server and open_browser in parallel
use simple command sleep

Here is the second way on macOS: (open command only works on macOS)

#!/bin/bash

LOCAL_URL=http://localhost:1313

open_browser () {
  duration=${1:-3}
  sleep $duration
  echo 'After '$duration
  # change open command to proper one
  open --new -a "Google Chrome" --args $LOCAL_URL
}

open_browser 1 &
hugo server

Reference:

https://github.com/gohugoio/hugo/issues/6293
https://www.cyberciti.biz/faq/how-to-run-command-or-code-in-parallel-in-bash-shell-under-linux-or-unix/
https://zwbetz.com/open-a-new-google-chrome-tab-or-window-via-command-line-on-mac"

DEV Community: Peter Lau

MongoDB |> server selection error: server selection timeout Type: ReplicaSetNoPrimary

Can markdown of dev.to do this ?

TOC

❓ wrap line in code (manually wrap) 🔙

✅ support strikethrough 🔙

✅ support table 🔙

✅ support emoji 🔙

CLI |> Compress and Decompress via CLI

macOS

GNU/Linux

Build X from source is so hard 😭

On Ubuntu 18.04:

servo / servo

The Servo Browser Engine

lumen / lumen

An alternative BEAM implementation, designed for WebAssembly

tensorbase / tensorbase

TensorBase is building a modern big data warehouse with performance in its core mind.

On macOS Catalina (Version 10.15.5)

d12frosted / homebrew-emacs-plus

Emacs Plus formulae for the Homebrew package manager

MongoDB |> How to Select a Single Field for All Documents in a MongoDB Collection

Hugo |> Dev Server Open Browser