Before making a decision, there are to clarify and consider from different perspective.

1 size of the file? 5K? 5G 5T?

2. Frequency? one time? once a day? or more?

3. If more than one time, how different between those files? incremental change or completely different?

4. Any expectation? as fast as possible? or intrusively to other applications?

5. how reliable?

Technical questions:

1. bottleneck: network topology&bandwidth, disk speed, memory size,
2. failure handling. retry,, version conflict

what to optimization, time or others?

break into pieces to reduce wait time?

integrity and consistency?

Finally worked out.

1. Keep mini controller on the camera, instead of connectors for phones
2. usb c—> mac
3. turn on pocket 2, wait for accepting connection to pc
4. click accept
5. launch finder on mac, open menu go–> go folder, fill in /Volumes, click Go button, you should see the folder…

docker container stopped working after upgrade to DSM 7.0 with Synology NAS.

This is due to tighten permission in DSM 7.0. It can be fixed by enabling container capacity “NET_ADMIN”. The problem is the DSM docker UI does not support this feature. This can be easier done in portainer, another open source container manager.

Here is the steps to deploy portainer as a container. This requires ssh into DSM 7.0

# ssh into your nas as administrator
ssh nas -l admin

# create  dir for holding portainer config
sudo mkdir  /volume1/docker/portainer

# deploy portainer as a container thru docker, please ensure ports still available
sudo docker run -d -p 8000:8000 -p 9000:9000 --name=portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v /volume1/docker/portainer:/data portainer/portainer-ce

If everything goes thru fine, portainer container should be up and running. This can be verified in dsm docker ui as well.

connect to portainer at http://nas:9000 in browser.

Set up initial password

Select connect to “docker”

go to containers:

You are supposed to see all your containers, haugene container should be stopped state. (one of mine is up since screenshot is taken after everything fixed.)

Please focus on container haugene-transimission-openvpn3, this is the original one that stopped working after upgrade to dsm 7.0.

open “haugene-transimission-openvpn3”

Click “Duplicate/Edit” button on the top right, then you will have an opportunity to re-config a copy of original container.

change the name so that you can tell this is a new container..

Click “Advanced container settings”

Disable “Privileged mode” in “Runtime & Resources” tab.

Enable “NET_ADMIN” in Capability tab.

Click “Deploy the container” button, then you are done. It should be up and running in a few secs.

Verify if traffics are going thru vpn at http://checkmyip.torrentprivacy.com/

import google.golang.org/api/compute/v1

compute.NewService(....)

IDE is having issue paring the generated library golang source code.


solution:
Go to help menu and open "edit custom properties"
increase or add the following "idea.max.intellisense.filesize"
problem should be gone after restarting IDE.
----------------------------
# custom GoLand properties

idea.max.intellisense.filesize=999999

Example:

A import B

B import A

X import A or B

Solution?

Abstract common things into an interface “I”.

Move I into it’s own package.

i.I

A return i.I

B import A & i.I, B create a implementation of i.I and set it on A

A <- B (so B only depends on B and I.i , A does not depend on B)

X ask A to return B

It’s tricky to using pointer in range iterator.

Please beware variable “hostStatus” is a pointer that’s been reused in each iteration. the location of hostStatus will be the same although it points to a different struct in each iteration.

It may cause duplicated values in the final results, beware!

package main

import (
	"fmt"
	"strings"

)


type HostStatus struct {
	Name    string
	Status  string
	Message string
}

func main() {
	value := []HostStatus{HostStatus{"1","ok","test1"}, HostStatus{"2","ok","test2"}, HostStatus{"3","ok","test3"}}
	fmt.Printf("value = %v\n", value)
	hostnameToStatus := map[string]HostStatus{}
	hostnameToStatusP := map[string]*HostStatus{}
	hostnameToStatusP2 := map[string]*HostStatus{}
	for k, hostStatus := range value {
		hostnameToStatus[hostStatus.Name] = hostStatus
		hostnameToStatusP[hostStatus.Name] = &value[k]
		hostnameToStatusP2[hostStatus.Name] = &hostStatus
		fmt.Printf("%s , p= %p\n", hostStatus.Name, &hostStatus)
	}
	fmt.Print("--1--\n")
	for k, v := range hostnameToStatus {
		fmt.Printf("%s = %s\n", k, v)
	}
	fmt.Print("--2--\n")
	for k, v := range hostnameToStatusP {
		fmt.Printf("%s = %s\n", k, v)
	}
	fmt.Print("--3--\n")
	for k, v := range hostnameToStatusP2 {
		fmt.Printf("%s = %v\n", k, v)
		fmt.Printf("%s = %p\n", k, &v)
	}

	successfulChildHostList := []string{}
	merged := []HostStatus{}
	for _, hostStatus := range hostnameToStatusP {
		merged = append(merged, *hostStatus)
		if strings.EqualFold(hostStatus.Status, "yes") {
			successfulChildHostList = append(successfulChildHostList, hostStatus.Name)
		}
	}
	fmt.Print("-----------\n")
	fmt.Printf("merged = %v\n", merged)
	fmt.Printf("successfulChildHostList = %v\n", successfulChildHostList)

}

Results, see the 3rd one with duplicated values.:

value = [{1 ok test1} {2 ok test2} {3 ok test3}]
1 , p= 0xc000068210
2 , p= 0xc000068210
3 , p= 0xc000068210
--1--
3 = {3 ok test3}
1 = {1 ok test1}
2 = {2 ok test2}
--2--
1 = &{1 ok test1}
2 = &{2 ok test2}
3 = &{3 ok test3}
--3--
1 = &{3 ok test3}
1 = 0xc00000e030
2 = &{3 ok test3}
2 = 0xc00000e030
3 = &{3 ok test3}
3 = 0xc00000e030
-----------
merged = [{1 ok test1} {2 ok test2} {3 ok test3}]
successfulChildHostList = []

Yes done() can be used as many times as you want.

here is an example:

package main

import (
        "context"
        "time"
)
func f(ctx context.Context) {
	for i:=0;i<10;i++{
		select {
		case <- ctx.Done():
			println("canceled")
		default:
			println(".")

		}

		time.Sleep(1*time.Second)
	}
	println("f exit")
}

func main() {

        ctx, cancel := context.WithCancel(context.Background())
        go f(ctx)
        time.Sleep(3*time.Second)
        println("call ctx cancel()")
        cancel()
        time.Sleep(10*time.Second)
        println("exit")
}

results:

go run cancel.go
.
.
.
call ctx cancel()
canceled
canceled
canceled
canceled
canceled
canceled
canceled
f exit
exit

See “canceled” got returned constantly after context was canceled.

Had first outage from early morning to the afternoon. Still no internet yet…. Keep waiting….