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docs/other/example1.md

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+``` bash
+# !/bin/bash
+function install_docker() {
+    if command -v docker &>/dev/null; then
+        return
+    fi
+
+    # script options
+    local script_host="linuxmirrors.cn" # official host (CDN), more host see official site
+    local close_firewall="true"         # close firewalld service and selinux (redhat systems need)
+    # mirrors options
+    local source_docker_ce_address="mirrors.tencent.com/docker-ce" # global high availability address
+    local source_docker_ce_protocol="https"                        # https or http
+    local source_docker_registry_address="registry.hub.docker.com"
+
+    # judge network environment
+    local region_code="$(curl -s ipinfo.io/country)"
+    if [[ "${region_code}" == "CN" ]]; then
+        local source_intranet_address=""
+        # use intranet source if possible
+        if [ -s "/sys/class/dmi/id/sys_vendor" ]; then
+            local sys_vendor="$(cat /sys/class/dmi/id/sys_vendor)"
+            if [[ "${sys_vendor}" == *"Alibaba"* ]]; then
+                source_intranet_address="mirrors.cloud.aliyuncs.com/docker-ce"
+            elif [[ "${sys_vendor}" == *"Huawei"* ]]; then
+                source_intranet_address="mirrors.myhuaweicloud.com/docker-ce"
+            elif [[ "${sys_vendor}" == *"Tencent"* ]]; then
+                source_intranet_address="mirrors.tencentyun.com/docker-ce"
+            elif [[ "${sys_vendor}" == *"Inspur"* ]]; then
+                source_intranet_address="mirrors.ivolces.com/docker-ce"
+            fi
+        else
+            cat /etc/motd | grep "Alibaba Cloud " -q
+            if [ $? -eq 0 ]; then
+                source_intranet_address="mirrors.cloud.aliyuncs.com/docker-ce"
+            fi
+        fi
+        # check connectivity
+        if [ -n "${source_intranet_address}" ]; then
+            if ping -c1 -W1 "${source_intranet_address%%/*}" >/dev/null 2>&1; then
+                source_docker_ce_address="${source_intranet_address}"
+                source_docker_ce_protocol="http"
+            fi
+        fi
+        # registry mirror (best choice for mainland China)
+        source_docker_registry_address="docker.1ms.run"
+    else
+        # use official source
+        source_docker_ce_address="download.docker.com"
+        source_docker_registry_address="registry.hub.docker.com"
+    fi
+
+    # install docker engine
+    bash <(curl -sSL https://${script_host}/docker.sh) \
+        --source "${source_docker_ce_address}" \
+        --source-registry "${source_docker_registry_address}" \
+        --protocol "${source_docker_ce_protocol}" \
+        --close-firewall "${close_firewall}" \
+        --install-latest true \
+        --ignore-backup-tips \
+        --pure-mode
+}
+
+install_docker
+```