小编vik*_*ava的帖子

当我尝试使用以下命令启动 docker 时：

sudo systemctl start docker 

我遇到以下错误

Failed to start docker.service: Unit not found.

我尝试在网上找到一些建议来解决此问题并遵循，但它没有解决问题。

CentOS7 无法启动 docker 守护进程

这是我的 docker.socket 文件 [这只是答案之一的复制粘贴]

[Unit]
Description=Docker Socket for the API
PartOf=docker.service

[Socket]
ListenStream=/var/run/docker.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker

[Install]
WantedBy=sockets.target

这是我在启动 docker.socket 时遇到的错误

sudo systemctl start docker.socket

See "systemctl status docker.socket" and "journalctl -xe" for details.

“systemctl status docker.socket”的输出

systemctl status docker.socket

systemd[1]: Socket service docker.service not loaded, refusing.
systemd[1]: Failed to listen on Docker Socket for the API.

docker 版本详细信息

Client: …

我正在尝试在 linux [Redhat] box 中安装 docker。但它因以下错误而失败。

Loaded plugins: product-id, search-disabled-repos, subscription-manager, susemanagerplugin, yumnotify
This system is not registered with an entitlement server. You can use subscription-manager to register.
 https://yum.dockerproject.org/repo/main/centos/7/repodata/repomd.xml: [Errno 
14] HTTPS Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below knowledge base article

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.



One of the configured repositories failed (Docker Repository),
and yum …

我正在尝试使用流将以下代码重构为 java8。我如何获得哈希图中任何特定键的值 请提出建议。

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class HashMapUtility {

public static void main(String[] args) {
    Map<String, List<Integer>> map = new HashMap<>();
    map.put("key1", Arrays.asList(1, 2, 3, 4));
    map.put("key2", Arrays.asList(4, 5, 6, 7));
    map.put("key3", Arrays.asList(8, 9, 10, 11));
    map.put("key4", Arrays.asList(12, 13, 14, 15));

    /*how to write it in JAVA8*/
    for (Map.Entry<String, List<Integer>> mapIter : map.entrySet()) {
        List<Integer> li = mapIter.getValue();
        for (Integer num : li) {
            if (num % 2 == 0) {
                System.out.println(num);
            }
        } …